diff --git a/packages/crystal/0.36.1/build.sh b/packages/crystal/0.36.1/build.sh
deleted file mode 100755
index ba10f3f..0000000
--- a/packages/crystal/0.36.1/build.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-PREFIX=$(realpath $(dirname $0))
-
-curl -L "https://github.com/crystal-lang/crystal/releases/download/0.36.1/crystal-0.36.1-1-linux-x86_64.tar.gz" -o crystal.tar.gz
-tar xzf crystal.tar.gz --strip-components=1
-rm crystal.tar.gz
diff --git a/packages/crystal/0.36.1/compile b/packages/crystal/0.36.1/compile
deleted file mode 100644
index afbad6c..0000000
--- a/packages/crystal/0.36.1/compile
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-
-# Compile crystal files into out file
-crystal build "$@" -o out --no-color && \
-chmod +x out
diff --git a/packages/crystal/0.36.1/environment b/packages/crystal/0.36.1/environment
deleted file mode 100644
index bd0ff98..0000000
--- a/packages/crystal/0.36.1/environment
+++ /dev/null
@@ -1 +0,0 @@
-export PATH=$PWD/bin:$PATH
\ No newline at end of file
diff --git a/packages/crystal/0.36.1/metadata.json b/packages/crystal/0.36.1/metadata.json
deleted file mode 100644
index ee995eb..0000000
--- a/packages/crystal/0.36.1/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "crystal",
-    "version": "0.36.1",
-    "aliases": ["crystal", "cr"]
-}
diff --git a/packages/crystal/0.36.1/run b/packages/crystal/0.36.1/run
deleted file mode 100644
index 6955ba9..0000000
--- a/packages/crystal/0.36.1/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-shift # Filename is only used to compile
-./out "$@"
diff --git a/packages/crystal/0.36.1/test.cr b/packages/crystal/0.36.1/test.cr
deleted file mode 100644
index 3fca0dd..0000000
--- a/packages/crystal/0.36.1/test.cr
+++ /dev/null
@@ -1 +0,0 @@
-puts("OK")
\ No newline at end of file
diff --git a/packages/dart/2.12.1/build.sh b/packages/dart/2.12.1/build.sh
deleted file mode 100755
index d202d7f..0000000
--- a/packages/dart/2.12.1/build.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/usr/bin/env bash
-
-curl -L "https://storage.googleapis.com/dart-archive/channels/stable/release/2.12.1/sdk/dartsdk-linux-x64-release.zip" -o dart.zip
-
-unzip dart.zip
-rm dart.zip
-
-cp -r dart-sdk/* .
-rm -rf dart-sdk
-
-chmod -R +rx bin
diff --git a/packages/dart/2.12.1/environment b/packages/dart/2.12.1/environment
deleted file mode 100644
index 780b668..0000000
--- a/packages/dart/2.12.1/environment
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH
diff --git a/packages/dart/2.12.1/metadata.json b/packages/dart/2.12.1/metadata.json
deleted file mode 100644
index cec3d77..0000000
--- a/packages/dart/2.12.1/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "dart",
-    "version": "2.12.1",
-    "aliases": []
-}
diff --git a/packages/dart/2.12.1/run b/packages/dart/2.12.1/run
deleted file mode 100644
index aae792a..0000000
--- a/packages/dart/2.12.1/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to run the runtime
-dart run "$@"
diff --git a/packages/dart/2.12.1/test.dart b/packages/dart/2.12.1/test.dart
deleted file mode 100644
index 27e87b2..0000000
--- a/packages/dart/2.12.1/test.dart
+++ /dev/null
@@ -1,3 +0,0 @@
-void main() {
-  print('OK');
-}
\ No newline at end of file
diff --git a/packages/dash/0.5.11/build.sh b/packages/dash/0.5.11/build.sh
deleted file mode 100755
index 202d5aa..0000000
--- a/packages/dash/0.5.11/build.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to build your package in here
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-curl "http://gondor.apana.org.au/~herbert/dash/files/dash-0.5.11.tar.gz" -o dash.tar.gz
-tar xzf dash.tar.gz --strip-components=1
-
-./configure --prefix "$PREFIX" &&
-make -j$(nproc) &&
-make install -j$(nproc)
-
-cd ../
-
-rm -rf build
diff --git a/packages/dash/0.5.11/environment b/packages/dash/0.5.11/environment
deleted file mode 100644
index 780b668..0000000
--- a/packages/dash/0.5.11/environment
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH
diff --git a/packages/dash/0.5.11/metadata.json b/packages/dash/0.5.11/metadata.json
deleted file mode 100644
index a2e5be5..0000000
--- a/packages/dash/0.5.11/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "dash",
-    "version": "0.5.11",
-    "aliases": ["dash"]
-}
diff --git a/packages/dash/0.5.11/run b/packages/dash/0.5.11/run
deleted file mode 100644
index 6a8a1da..0000000
--- a/packages/dash/0.5.11/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to run the runtime
-dash "$@"
diff --git a/packages/dash/0.5.11/test.dash b/packages/dash/0.5.11/test.dash
deleted file mode 100644
index 727518f..0000000
--- a/packages/dash/0.5.11/test.dash
+++ /dev/null
@@ -1 +0,0 @@
-echo "OK"
\ No newline at end of file
diff --git a/packages/deno/1.16.2/build.sh b/packages/deno/1.16.2/build.sh
deleted file mode 100644
index ec5c1d0..0000000
--- a/packages/deno/1.16.2/build.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/bash
-
-curl -OL https://github.com/denoland/deno/releases/download/v1.16.2/deno-x86_64-unknown-linux-gnu.zip
-unzip -o deno-x86_64-unknown-linux-gnu.zip
-rm deno-x86_64-unknown-linux-gnu.zip
diff --git a/packages/deno/1.16.2/environment b/packages/deno/1.16.2/environment
deleted file mode 100644
index d5a7803..0000000
--- a/packages/deno/1.16.2/environment
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-export PATH=$PWD:$PATH
diff --git a/packages/deno/1.16.2/metadata.json b/packages/deno/1.16.2/metadata.json
deleted file mode 100644
index 8043242..0000000
--- a/packages/deno/1.16.2/metadata.json
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-    "language": "deno",
-    "version": "1.16.2",
-    "dependencies": {},
-    "provides": [
-        {
-            "language": "typescript",
-            "aliases": [
-                "deno",
-                "deno-ts"
-            ]
-        },
-        {
-            "language": "javascript",
-            "aliases": [
-                "deno-js"
-            ]
-        }
-    ]
-}
diff --git a/packages/deno/1.16.2/run b/packages/deno/1.16.2/run
deleted file mode 100644
index 288919f..0000000
--- a/packages/deno/1.16.2/run
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-DENO_DIR=$PWD deno run $@
diff --git a/packages/deno/1.16.2/test.deno.ts b/packages/deno/1.16.2/test.deno.ts
deleted file mode 100644
index 0b555b7..0000000
--- a/packages/deno/1.16.2/test.deno.ts
+++ /dev/null
@@ -1 +0,0 @@
-console.log("OK")
diff --git a/packages/deno/1.7.5/build.sh b/packages/deno/1.7.5/build.sh
deleted file mode 100755
index 165d3b6..0000000
--- a/packages/deno/1.7.5/build.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-curl -L https://github.com/denoland/deno/releases/download/v1.7.5/deno-x86_64-unknown-linux-gnu.zip --output deno.zip
-unzip -o deno.zip
-rm deno.zip
-
-chmod +x deno
diff --git a/packages/deno/1.7.5/environment b/packages/deno/1.7.5/environment
deleted file mode 100644
index 98fd770..0000000
--- a/packages/deno/1.7.5/environment
+++ /dev/null
@@ -1 +0,0 @@
-export PATH=$PWD:$PATH
\ No newline at end of file
diff --git a/packages/deno/1.7.5/metadata.json b/packages/deno/1.7.5/metadata.json
deleted file mode 100644
index 217a7c6..0000000
--- a/packages/deno/1.7.5/metadata.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-    "language": "deno",
-    "version": "1.7.5",
-    "provides": [
-        {
-            "language": "typescript",
-            "aliases": ["deno-ts", "deno"]
-        },
-        {
-            "language": "javascript",
-            "aliases": ["deno-js"]
-        }
-    ]
-}
diff --git a/packages/deno/1.7.5/run b/packages/deno/1.7.5/run
deleted file mode 100644
index d1b196f..0000000
--- a/packages/deno/1.7.5/run
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/bash
-DENO_DIR=$PWD deno run "$@"
\ No newline at end of file
diff --git a/packages/deno/1.7.5/test.deno.ts b/packages/deno/1.7.5/test.deno.ts
deleted file mode 100644
index e106678..0000000
--- a/packages/deno/1.7.5/test.deno.ts
+++ /dev/null
@@ -1 +0,0 @@
-console.log('OK');
diff --git a/packages/elixir/1.11.3/build.sh b/packages/elixir/1.11.3/build.sh
deleted file mode 100755
index 9328d8c..0000000
--- a/packages/elixir/1.11.3/build.sh
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/bin/bash
-
-source ../../erlang/23.0.0/build.sh
-
-export PATH=$PWD/bin:$PATH
-
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-curl -L "https://github.com/elixir-lang/elixir/archive/v1.11.3.tar.gz" -o elixir.tar.gz
-tar xzf elixir.tar.gz --strip-components=1
-rm elixir.tar.gz
-
-./configure --prefix "$PREFIX"
-make -j$(nproc)
-
-cd ..
-
-cp -r build/bin .
-cp -r build/lib .
-
-rm -rf build
diff --git a/packages/elixir/1.11.3/environment b/packages/elixir/1.11.3/environment
deleted file mode 100644
index ea24603..0000000
--- a/packages/elixir/1.11.3/environment
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export LC_ALL=en_US.UTF-8
-export PATH=$PWD/bin:$PATH
diff --git a/packages/elixir/1.11.3/metadata.json b/packages/elixir/1.11.3/metadata.json
deleted file mode 100644
index 9c1a2fc..0000000
--- a/packages/elixir/1.11.3/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "elixir",
-    "version": "1.11.3",
-    "aliases": ["elixir", "exs"]
-}
diff --git a/packages/elixir/1.11.3/run b/packages/elixir/1.11.3/run
deleted file mode 100644
index 9b3ba9c..0000000
--- a/packages/elixir/1.11.3/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-# Put instructions to run the runtime
-elixir "$@"
\ No newline at end of file
diff --git a/packages/elixir/1.11.3/test.exs b/packages/elixir/1.11.3/test.exs
deleted file mode 100644
index bc837c6..0000000
--- a/packages/elixir/1.11.3/test.exs
+++ /dev/null
@@ -1 +0,0 @@
-IO.puts("OK")
\ No newline at end of file
diff --git a/packages/erlang/23.0.0/build.sh b/packages/erlang/23.0.0/build.sh
deleted file mode 100755
index f282bc2..0000000
--- a/packages/erlang/23.0.0/build.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-curl "http://erlang.org/download/otp_src_23.0.tar.gz" -o erlang.tar.gz
-tar xzf erlang.tar.gz --strip-components=1
-rm erlang.tar.gz
-
-export ERL_TOP=$(pwd)
-./configure --prefix "$PREFIX"
-make -j$(nproc)
-make install -j$(nproc)
-
-cd ..
-
-rm -rf build 
-
diff --git a/packages/erlang/23.0.0/environment b/packages/erlang/23.0.0/environment
deleted file mode 100644
index 780b668..0000000
--- a/packages/erlang/23.0.0/environment
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH
diff --git a/packages/erlang/23.0.0/metadata.json b/packages/erlang/23.0.0/metadata.json
deleted file mode 100644
index e82b4b3..0000000
--- a/packages/erlang/23.0.0/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "erlang",
-    "version": "23.0.0",
-    "aliases": ["erlang", "erl", "escript"]
-}
diff --git a/packages/erlang/23.0.0/run b/packages/erlang/23.0.0/run
deleted file mode 100644
index 135d9f4..0000000
--- a/packages/erlang/23.0.0/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-# Put instructions to run the runtime
-escript "$@"
\ No newline at end of file
diff --git a/packages/erlang/23.0.0/test.erl b/packages/erlang/23.0.0/test.erl
deleted file mode 100644
index d898d2c..0000000
--- a/packages/erlang/23.0.0/test.erl
+++ /dev/null
@@ -1,3 +0,0 @@
-
-main(_) ->
-    io:format("OK~n").
\ No newline at end of file
diff --git a/packages/file/0.0.1/build.sh b/packages/file/0.0.1/build.sh
deleted file mode 100755
index d7ab47e..0000000
--- a/packages/file/0.0.1/build.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-# Nothing to do here
diff --git a/packages/file/0.0.1/environment b/packages/file/0.0.1/environment
deleted file mode 100644
index d5a7803..0000000
--- a/packages/file/0.0.1/environment
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-export PATH=$PWD:$PATH
diff --git a/packages/file/0.0.1/metadata.json b/packages/file/0.0.1/metadata.json
deleted file mode 100644
index ae34ae9..0000000
--- a/packages/file/0.0.1/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "file",
-    "version": "0.0.1",
-    "aliases": ["executable", "elf", "binary"]
-}
diff --git a/packages/file/0.0.1/run b/packages/file/0.0.1/run
deleted file mode 100644
index 77ed0a6..0000000
--- a/packages/file/0.0.1/run
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/bash
-
-filename="$1"
-chmod +x "$filename"
-shift
-./"$filename" "$@"
diff --git a/packages/file/0.0.1/test.file b/packages/file/0.0.1/test.file
deleted file mode 100755
index 8c7a67d..0000000
Binary files a/packages/file/0.0.1/test.file and /dev/null differ
diff --git a/packages/gawk/5.1.0/build.sh b/packages/gawk/5.1.0/build.sh
deleted file mode 100644
index 81fb998..0000000
--- a/packages/gawk/5.1.0/build.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to build your package in here
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-curl "https://ftp.gnu.org/gnu/gawk/gawk-5.1.0.tar.gz" -o gawk.tar.gz
-
-tar xzf gawk.tar.gz --strip-components=1
-
-# === autoconf based ===
-./configure --prefix "$PREFIX"
-
-make -j$(nproc)
-make install -j$(nproc)
-cd ../
-rm -rf build
-
diff --git a/packages/gawk/5.1.0/environment b/packages/gawk/5.1.0/environment
deleted file mode 100644
index 780b668..0000000
--- a/packages/gawk/5.1.0/environment
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH
diff --git a/packages/gawk/5.1.0/metadata.json b/packages/gawk/5.1.0/metadata.json
deleted file mode 100644
index 1ae8c16..0000000
--- a/packages/gawk/5.1.0/metadata.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-    "language": "gawk",
-    "version": "5.1.0",
-    "provides": [
-        {
-            "language": "awk",
-            "aliases": ["gawk"]
-        }
-    ]
-}
diff --git a/packages/gawk/5.1.0/run b/packages/gawk/5.1.0/run
deleted file mode 100644
index 5134ddf..0000000
--- a/packages/gawk/5.1.0/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to run the runtime
-gawk-5.1.0 -f "$@"
diff --git a/packages/gawk/5.1.0/test.awk b/packages/gawk/5.1.0/test.awk
deleted file mode 100644
index 25e1bd3..0000000
--- a/packages/gawk/5.1.0/test.awk
+++ /dev/null
@@ -1 +0,0 @@
-{print "OK"}
\ No newline at end of file
diff --git a/packages/python/3.10.0/build.sh b/packages/python/3.10.0/build.sh
deleted file mode 100755
index 00c839a..0000000
--- a/packages/python/3.10.0/build.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-
-PREFIX=$(realpath $(dirname $0))
-
-mkdir -p build
-
-cd build
-
-curl "https://www.python.org/ftp/python/3.10.0/Python-3.10.0.tgz" -o python.tar.gz
-tar xzf python.tar.gz --strip-components=1
-rm python.tar.gz
-
-./configure --prefix "$PREFIX" --with-ensurepip=install
-make -j$(nproc)
-make install -j$(nproc)
-
-cd ..
-
-rm -rf build
-
-bin/pip3 install numpy scipy pandas pycrypto whoosh bcrypt passlib sympy
diff --git a/packages/python/3.10.0/environment b/packages/python/3.10.0/environment
deleted file mode 100644
index 977a5e8..0000000
--- a/packages/python/3.10.0/environment
+++ /dev/null
@@ -1 +0,0 @@
-export PATH=$PWD/bin:$PATH
diff --git a/packages/python/3.10.0/metadata.json b/packages/python/3.10.0/metadata.json
deleted file mode 100644
index b767f8d..0000000
--- a/packages/python/3.10.0/metadata.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "language": "python",
-    "version": "3.10.0",
-    "aliases": ["py", "py3", "python3", "python3.10"]
-}
diff --git a/packages/python/3.10.0/run b/packages/python/3.10.0/run
deleted file mode 100644
index d141a0d..0000000
--- a/packages/python/3.10.0/run
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-python3.10 "$@"
diff --git a/packages/python/3.10.0/test.py b/packages/python/3.10.0/test.py
deleted file mode 100644
index 1784bfa..0000000
--- a/packages/python/3.10.0/test.py
+++ /dev/null
@@ -1,7 +0,0 @@
-working = True
-
-match working:
-    case True:
-        print("OK")
-    case False:
-        print()
diff --git a/runtimes/crystal.nix b/runtimes/crystal.nix
new file mode 100644
index 0000000..9cbae9d
--- /dev/null
+++ b/runtimes/crystal.nix
@@ -0,0 +1,31 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.crystal;
+in piston.mkRuntime {
+    language = "crystal";
+    version = pkg.version;
+
+    aliases = [
+        "cr"
+    ];
+
+    compile = ''
+    ${pkg}/bin/crystal build "$@" -o out --no-color
+    chmod +x out
+    '';
+
+    run = ''
+    shift
+    ./out "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.cr" = ''
+                    puts("OK")
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/dart.nix b/runtimes/dart.nix
new file mode 100644
index 0000000..d5e0981
--- /dev/null
+++ b/runtimes/dart.nix
@@ -0,0 +1,25 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.dart;
+in piston.mkRuntime {
+    language = "dart";
+    version = pkg.version;
+
+    aliases = [];
+
+    run = ''
+    ${pkg}/bin/dart run "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.dart" = ''
+                    void main() {
+                        print('OK');
+                    }
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/dash.nix b/runtimes/dash.nix
new file mode 100644
index 0000000..6da4f4e
--- /dev/null
+++ b/runtimes/dash.nix
@@ -0,0 +1,22 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.dash;
+in piston.mkRuntime {
+    language = "dash";
+    version = pkg.version;
+
+    aliases = [];
+
+    run = ''
+    ${pkg}/bin/dash "$@"
+    '';
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.dash" = ''
+                    echo "OK"
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/default.nix b/runtimes/default.nix
index 2c3ddc4..0571829 100644
--- a/runtimes/default.nix
+++ b/runtimes/default.nix
@@ -5,4 +5,12 @@ args: {
     "bash" = import ./bash.nix args;
     "clojure" = import ./clojure.nix args;
     "cobol-gnu-cobol" = import ./cobol-gnu-cobol.nix args;
+    "crystal" = import ./crystal.nix args;
+    "dart" = import ./dart.nix args;
+    "dash" = import ./dash.nix args;
+    "deno-javascript" = import ./deno-javascript.nix args;
+    "deno-typescript" = import ./deno-typescript.nix args;
+    "elixir" = import ./elixir.nix args;
+    "erlang" = import ./erlang.nix args;
+    "gawk-awk" = import ./gawk-awk.nix args;
 }
diff --git a/runtimes/deno-javascript.nix b/runtimes/deno-javascript.nix
new file mode 100644
index 0000000..2e6970e
--- /dev/null
+++ b/runtimes/deno-javascript.nix
@@ -0,0 +1,27 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.deno;
+in piston.mkRuntime {
+    language = "javascript";
+    version = pkg.version;
+    runtime = "deno";
+
+    aliases = [
+        "js"
+        "deno-js"
+    ];
+
+    run = ''
+    DENO_DIR=$PWD ${pkg}/bin/deno run $@
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.js" = ''
+                    console.log("OK");
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/deno-typescript.nix b/runtimes/deno-typescript.nix
new file mode 100644
index 0000000..50d0fa6
--- /dev/null
+++ b/runtimes/deno-typescript.nix
@@ -0,0 +1,27 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.deno;
+in piston.mkRuntime {
+    language = "typescript";
+    version = pkg.version;
+    runtime = "deno";
+
+    aliases = [
+        "ts"
+        "deno-ts"
+    ];
+
+    run = ''
+    DENO_DIR=$PWD ${pkg}/bin/deno run $@
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.ts" = ''
+                    console.log("OK");
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/elixir.nix b/runtimes/elixir.nix
new file mode 100644
index 0000000..39cb962
--- /dev/null
+++ b/runtimes/elixir.nix
@@ -0,0 +1,30 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.elixir;
+in piston.mkRuntime {
+    language = "elixir";
+    version = pkg.version;
+
+    aliases = [
+        "exs"
+    ];
+
+    run = ''
+    export LC_ALL=en_US.UTF-8
+    ${pkg}/bin/elixir "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.exs" = ''
+                    IO.puts("OK")
+                '';
+            };
+        })
+    ];
+
+    limitOverrides = {
+        "max_file_size" = 100000000; # 100MB
+    };
+}
\ No newline at end of file
diff --git a/runtimes/erlang.nix b/runtimes/erlang.nix
new file mode 100644
index 0000000..efac6a1
--- /dev/null
+++ b/runtimes/erlang.nix
@@ -0,0 +1,28 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.erlang;
+in piston.mkRuntime {
+    language = "erlang";
+    version = pkg.version;
+
+    aliases = [
+        "erl"
+        "escript"
+    ];
+
+    run = ''
+    ${pkg}/bin/escript "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.erl" = ''
+                    
+                    main(_) ->
+                        io:format("OK~n").
+                '';
+            };
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/gawk-awk.nix b/runtimes/gawk-awk.nix
new file mode 100644
index 0000000..c5c9675
--- /dev/null
+++ b/runtimes/gawk-awk.nix
@@ -0,0 +1,26 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.gawk;
+in piston.mkRuntime {
+    language = "awk";
+    version = pkg.version;
+    runtime = "gawk";
+
+    aliases = [];
+
+
+    run = ''
+    ${pkg}/bin/gawk -f "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.awk" = ''
+                    {print "OK"}
+                '';
+            };
+            stdin = "\n"; # awk needs some line input
+        })
+    ];
+}
\ No newline at end of file