diff --git a/packages/brainfuck/2.7.3/build.sh b/packages/brainfuck/2.7.3/build.sh
new file mode 100644
index 0000000..50c1868
--- /dev/null
+++ b/packages/brainfuck/2.7.3/build.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# Put instructions to build your package in here
+PREFIX=$(realpath $(dirname $0))
+
+git clone https://github.com/fabianishere/brainfuck.git
+
+cd brainfuck
+git checkout 06f84462e0a96487670a4b8024e3ec531e0377ee
+
+
+mkdir -p build
+
+cd build
+
+cmake .. -DCMAKE_INSTALL_PREFIX=$PREFIX/ -DENABLE_EDITLINE=OFF
+
+make -j$(nproc)
+make install -j$(nproc)
+
+cd ../../
+rm -rf brainfuck
diff --git a/packages/brainfuck/2.7.3/environment b/packages/brainfuck/2.7.3/environment
new file mode 100644
index 0000000..780b668
--- /dev/null
+++ b/packages/brainfuck/2.7.3/environment
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Put 'export' statements here for environment variables
+export PATH=$PWD/bin:$PATH
diff --git a/packages/brainfuck/2.7.3/metadata.json b/packages/brainfuck/2.7.3/metadata.json
new file mode 100644
index 0000000..a9f3083
--- /dev/null
+++ b/packages/brainfuck/2.7.3/metadata.json
@@ -0,0 +1,5 @@
+{
+    "language": "brainfuck",
+    "version": "2.7.3",
+    "aliases": ["bf"]
+}
diff --git a/packages/brainfuck/2.7.3/run b/packages/brainfuck/2.7.3/run
new file mode 100644
index 0000000..7c4e7dd
--- /dev/null
+++ b/packages/brainfuck/2.7.3/run
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Put instructions to run the runtime
+fold -w1 | brainfuck $1
diff --git a/packages/brainfuck/2.7.3/test.bf b/packages/brainfuck/2.7.3/test.bf
new file mode 100644
index 0000000..d0c07ec
--- /dev/null
+++ b/packages/brainfuck/2.7.3/test.bf
@@ -0,0 +1 @@
+-[--->+<]>------.----.
\ No newline at end of file
diff --git a/packages/coffeescript/2.5.1/build.sh b/packages/coffeescript/2.5.1/build.sh
new file mode 100755
index 0000000..58d99b2
--- /dev/null
+++ b/packages/coffeescript/2.5.1/build.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Download and install NodeJS
+curl "https://nodejs.org/dist/v15.10.0/node-v15.10.0-linux-x64.tar.xz" -o node.tar.xz
+tar xf node.tar.xz --strip-components=1
+rm node.tar.xz
+export PATH=$PWD/bin:$PATH
+
+# Install CoffeeScript via npm and done
+npm install --global coffeescript@2.5.1
diff --git a/packages/coffeescript/2.5.1/environment b/packages/coffeescript/2.5.1/environment
new file mode 100644
index 0000000..bd0ff98
--- /dev/null
+++ b/packages/coffeescript/2.5.1/environment
@@ -0,0 +1 @@
+export PATH=$PWD/bin:$PATH
\ No newline at end of file
diff --git a/packages/coffeescript/2.5.1/metadata.json b/packages/coffeescript/2.5.1/metadata.json
new file mode 100644
index 0000000..23380d1
--- /dev/null
+++ b/packages/coffeescript/2.5.1/metadata.json
@@ -0,0 +1,5 @@
+{
+    "language": "coffeescript",
+    "version": "2.5.1",
+    "aliases": ["coffeescript", "coffee"]
+}
diff --git a/packages/coffeescript/2.5.1/run b/packages/coffeescript/2.5.1/run
new file mode 100644
index 0000000..5d8cc03
--- /dev/null
+++ b/packages/coffeescript/2.5.1/run
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+coffee "$@"
diff --git a/packages/coffeescript/2.5.1/test.coffee b/packages/coffeescript/2.5.1/test.coffee
new file mode 100644
index 0000000..b3a8f72
--- /dev/null
+++ b/packages/coffeescript/2.5.1/test.coffee
@@ -0,0 +1 @@
+console.log "OK"
\ No newline at end of file
diff --git a/packages/llvm_ir/12.0.1/build.sh b/packages/llvm_ir/12.0.1/build.sh
new file mode 100755
index 0000000..7afd41a
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/build.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+curl -L "https://github.com/llvm/llvm-project/releases/download/llvmorg-12.0.1/clang+llvm-12.0.1-x86_64-linux-gnu-ubuntu-16.04.tar.xz" -o llvm-ir.tar.xz
+
+tar xf llvm-ir.tar.xz clang+llvm-12.0.1-x86_64-linux-gnu-ubuntu-/bin --strip-components=1
+
+rm llvm-ir.tar.xz
diff --git a/packages/llvm_ir/12.0.1/compile b/packages/llvm_ir/12.0.1/compile
new file mode 100755
index 0000000..082fb5c
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/compile
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+llc "$@" -o binary.s
+clang binary.s -o binary
diff --git a/packages/llvm_ir/12.0.1/environment b/packages/llvm_ir/12.0.1/environment
new file mode 100644
index 0000000..85a25b6
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/environment
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+export PATH=$PWD/bin:$PATH
diff --git a/packages/llvm_ir/12.0.1/metadata.json b/packages/llvm_ir/12.0.1/metadata.json
new file mode 100644
index 0000000..50dfbbc
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/metadata.json
@@ -0,0 +1,5 @@
+{
+    "language": "llvm_ir",
+    "version": "12.0.1",
+    "aliases": ["llvm", "llvm-ir", "ll"]
+}
diff --git a/packages/llvm_ir/12.0.1/run b/packages/llvm_ir/12.0.1/run
new file mode 100644
index 0000000..94b3b0b
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/run
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+shift
+binary "$@"
diff --git a/packages/llvm_ir/12.0.1/test.ll b/packages/llvm_ir/12.0.1/test.ll
new file mode 100644
index 0000000..be7d5d3
--- /dev/null
+++ b/packages/llvm_ir/12.0.1/test.ll
@@ -0,0 +1,10 @@
+@.str = private unnamed_addr constant [2 x i8] c"OK"
+
+declare i32 @puts(i8* nocapture) nounwind
+
+define i32 @main() {
+    %cast210 = getelementptr [2 x i8],[2 x i8]* @.str, i64 0, i64 0
+
+    call i32 @puts(i8* %cast210)
+    ret i32 0
+}
diff --git a/packages/mono/6.12.0/build.sh b/packages/mono/6.12.0/build.sh
new file mode 100755
index 0000000..7bb4b63
--- /dev/null
+++ b/packages/mono/6.12.0/build.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+PREFIX=$(realpath $(dirname $0))
+
+mkdir -p build/mono build/mono-basic
+cd build
+
+curl "https://download.mono-project.com/sources/mono/mono-6.12.0.122.tar.xz" -o mono.tar.xz
+curl -L "https://github.com/mono/mono-basic/archive/refs/tags/4.7.tar.gz" -o mono-basic.tar.gz
+tar xf mono.tar.xz --strip-components=1 -C mono
+tar xf mono-basic.tar.gz --strip-components=1 -C mono-basic
+
+# Compiling Mono
+cd mono
+
+./configure --prefix "$PREFIX"
+
+make -j$(nproc)
+make install -j$(nproc)
+
+export PATH="$PREFIX/bin:$PATH"  # To be able to use mono commands
+
+# Compiling mono-basic
+cd ../mono-basic
+./configure --prefix="$PREFIX"
+
+make -j$(nproc) PLATFORM="linux"  # Avoids conflict with the $PLATFORM variable we have
+make install -j$(nproc) PLATFORM="linux"
+
+# Remove redundant files
+cd ../../
+rm -rf build
diff --git a/packages/mono/6.12.0/compile b/packages/mono/6.12.0/compile
new file mode 100644
index 0000000..5246bc2
--- /dev/null
+++ b/packages/mono/6.12.0/compile
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+case "${PISTON_LANGUAGE}" in
+    csharp)
+        rename 's/$/\.cs/' "$@" # Add .cs extension
+        csc -out:out *.cs
+        ;;
+    basic)
+        rename 's/$/\.vb/' "$@" # Add .vb extension
+        vbnc -out:out *.vb
+        ;;
+    *)
+        echo "How did you get here? (${PISTON_LANGUAGE})"
+        exit 1
+        ;;
+esac
diff --git a/packages/mono/6.12.0/environment b/packages/mono/6.12.0/environment
new file mode 100644
index 0000000..977a5e8
--- /dev/null
+++ b/packages/mono/6.12.0/environment
@@ -0,0 +1 @@
+export PATH=$PWD/bin:$PATH
diff --git a/packages/mono/6.12.0/metadata.json b/packages/mono/6.12.0/metadata.json
new file mode 100644
index 0000000..3f483a4
--- /dev/null
+++ b/packages/mono/6.12.0/metadata.json
@@ -0,0 +1,20 @@
+{
+    "language": "mono",
+    "version": "6.12.0",
+    "provides": [
+        {
+            "language": "csharp",
+            "aliases": ["mono", "mono-csharp", "mono-c#", "mono-cs", "c#", "cs"]
+        },
+        {
+            "language": "basic",
+            "aliases": [
+                "vb",
+                "mono-vb",
+                "mono-basic",
+                "visual-basic",
+                "visual basic"
+            ]
+        }
+    ]
+}
diff --git a/packages/mono/6.12.0/run b/packages/mono/6.12.0/run
new file mode 100644
index 0000000..5a2e015
--- /dev/null
+++ b/packages/mono/6.12.0/run
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+shift
+mono out "$@"
\ No newline at end of file
diff --git a/packages/mono/6.12.0/test.cs b/packages/mono/6.12.0/test.cs
new file mode 100644
index 0000000..e91a2a2
--- /dev/null
+++ b/packages/mono/6.12.0/test.cs
@@ -0,0 +1,9 @@
+using System;
+
+public class Test
+{
+    public static void Main(string[] args)
+    {
+        Console.WriteLine("OK");
+    }
+}
\ No newline at end of file
diff --git a/packages/mono/6.12.0/test.vb b/packages/mono/6.12.0/test.vb
new file mode 100644
index 0000000..291042e
--- /dev/null
+++ b/packages/mono/6.12.0/test.vb
@@ -0,0 +1,9 @@
+Imports System
+
+Module Module1
+
+    Sub Main()
+        Console.WriteLine("OK")
+    End Sub
+
+End Module
diff --git a/packages/scala/3.0.0/build.sh b/packages/scala/3.0.0/build.sh
new file mode 100755
index 0000000..4cbf363
--- /dev/null
+++ b/packages/scala/3.0.0/build.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Download and extract JDK8
+curl -L "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz" -o jdk.tar.gz
+tar xzf jdk.tar.gz --strip-components=1
+rm jdk.tar.gz
+
+# Download and extract Scala 3
+curl -L "https://github.com/lampepfl/dotty/releases/download/3.0.0/scala3-3.0.0.tar.gz" -o scala.tar.gz
+tar -xzf scala.tar.gz --strip-components=1
+rm scala.tar.gz
diff --git a/packages/scala/3.0.0/compile b/packages/scala/3.0.0/compile
new file mode 100644
index 0000000..25853ef
--- /dev/null
+++ b/packages/scala/3.0.0/compile
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# Compile scala classes into a jar file
+scalac "$@" -d out.jar
+
+# Create the Manifest and include scala lib jars:
+# NOTE: - entry point will only consider @main and App traits from the main file
+#       - scala lib jars will be added to the class path in order to run the jar properly
+echo "Main-Class: $(grep -oP '\@main\s+def\s+\K[a-zA-Z][a-zA-Z0-9]*|object\s+\K[a-zA-Z][a-zA-Z0-9]*(?=\s+extends\s+App)' $1)
+Class-Path:  $(echo $JAVA_HOME/lib/*.jar | sed 's/\s/\n  /g')
+
+" > manifest.txt
+
+# Update the jar with the manifest
+jar ufm out.jar manifest.txt
diff --git a/packages/scala/3.0.0/environment b/packages/scala/3.0.0/environment
new file mode 100644
index 0000000..a1fcafe
--- /dev/null
+++ b/packages/scala/3.0.0/environment
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+# Scala requires JAVA_HOME to be set
+export JAVA_HOME=$PWD
+export PATH=$PWD/bin:$PATH
diff --git a/packages/scala/3.0.0/metadata.json b/packages/scala/3.0.0/metadata.json
new file mode 100644
index 0000000..37bccf8
--- /dev/null
+++ b/packages/scala/3.0.0/metadata.json
@@ -0,0 +1,5 @@
+{
+    "language": "scala",
+    "version": "3.0.0",
+    "aliases": ["sc"]
+}
diff --git a/packages/scala/3.0.0/run b/packages/scala/3.0.0/run
new file mode 100644
index 0000000..afcc045
--- /dev/null
+++ b/packages/scala/3.0.0/run
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+# Run jar file
+shift
+java -jar out.jar "$@"
diff --git a/packages/scala/3.0.0/test.scala b/packages/scala/3.0.0/test.scala
new file mode 100644
index 0000000..bf4cabc
--- /dev/null
+++ b/packages/scala/3.0.0/test.scala
@@ -0,0 +1,3 @@
+@main def run(): Unit = {
+  println("OK")
+}
\ No newline at end of file
diff --git a/runtimes/brainfuck.nix b/runtimes/brainfuck.nix
deleted file mode 100644
index 3acf84b..0000000
--- a/runtimes/brainfuck.nix
+++ /dev/null
@@ -1,55 +0,0 @@
-{pkgs, piston, ...}:
-let
-    # All other BF packages are either marked as broken in nix-pkgs
-    # or have missing functionality. Yabi isn't perfect either.
-    pkg = pkgs.haskellPackages.yabi;
-in piston.mkRuntime {
-    language = "brainfuck";
-    version = pkg.version;
-
-    aliases = [
-        "bf"
-        "yabi"
-    ];
-
-    run = ''
-        # Yabi produces messages when parsing the BF file that are sent to stderr
-        # Yabi will also break when trying to take more input at EOF
-        ${pkg}/bin/yabi "$1" 2> /dev/null
-    '';
-
-    tests = [
-        # stdout test
-        (piston.mkTest {
-            files = {
-                "test.bf" = ''-[--->+<]>------.----.'';
-            };
-            args = [];
-            stdin = "";
-            packages = [];
-            main = "test.bf";
-        })
-
-        # stdin test
-        (piston.mkTest {
-            files = {
-                "test.bf" = '',.,.'';
-            };
-            args = [];
-            stdin = "OK";
-            packages = [];
-            main = "test.bf";
-        })
-
-        # bf doesn't take args test
-        (piston.mkTest {
-            files = {
-                "test.bf" = ''-[--->+<]>------.----.'';
-            };
-            args = ["OK"];
-            stdin = "";
-            packages = [];
-            main = "test.bf";
-        })
-    ];
-}
\ No newline at end of file
diff --git a/runtimes/default.nix b/runtimes/default.nix
index 4624670..b2cf206 100644
--- a/runtimes/default.nix
+++ b/runtimes/default.nix
@@ -58,9 +58,4 @@ args: {
     "dotnet-sdk-fsharp-interactive" = import ./dotnet-sdk-fsharp-interactive.nix args;
     "dotnet-sdk-visual-basic" = import ./dotnet-sdk-visual-basic.nix args;
     "fpc-pascal" = import ./fpc-pascal.nix args;
-    "brainfuck" = import ./brainfuck.nix args;
-    "node-coffeescript" = import ./node-coffeescript.nix args;
-    "jvm-scala" = import ./jvm-scala.nix args;
-    "llvm_ir" = import ./llvm_ir.nix args;
-    "mono-basic" = import ./mono-basic.nix args;
 }
diff --git a/runtimes/jvm-scala.nix b/runtimes/jvm-scala.nix
deleted file mode 100644
index ab72b36..0000000
--- a/runtimes/jvm-scala.nix
+++ /dev/null
@@ -1,54 +0,0 @@
-{pkgs, piston, ...}:
-let
-    pkg = pkgs.scala;
-    java = pkgs.jdk8;
-    sed = pkgs.gnused;
-in piston.mkRuntime {
-    language = "scala";
-    version = pkg.version;
-    runtime = "jvm";
-
-    aliases = [
-        "sc"
-    ];
-
-    compile = ''
-        # Compile scala classes into a jar file
-        ${pkg}/bin/scalac "$@" -d out.jar
-
-        # Capture extra class-path libraries
-        java_libs="$(echo ${java}/lib/openjdk/lib/*.jar | ${sed}/bin/sed 's/\s/\\n  /g')"
-        scala_libs="$(echo ${pkg}/lib/*.jar | ${sed}/bin/sed 's/\s/\\n  /g')"
-
-        echo -e "Class-Path:  $java_libs
-          $scala_libs
-        " > classPath
-
-        # Update the jar manifest with scala libs
-        ${java}/bin/jar umf classPath out.jar
-    '';
-
-    run = ''
-        # Run jar from compile
-        shift
-        ${java}/bin/java -jar out.jar "$@"
-    '';
-
-    tests = [
-        (piston.mkTest {
-            files = {
-                "test.sc" = ''
-                    object Main {
-                        def main(args: Array[String]) = {
-                            println("OK")
-                        }
-                    }
-                '';
-            };
-            args = [];
-            stdin = "";
-            packages = [];
-            main = "test.sc";
-        })
-    ];
-}
\ No newline at end of file
diff --git a/runtimes/llvm_ir.nix b/runtimes/llvm_ir.nix
deleted file mode 100644
index 2f736aa..0000000
--- a/runtimes/llvm_ir.nix
+++ /dev/null
@@ -1,47 +0,0 @@
-{pkgs, piston, ...}:
-let
-    pkg = pkgs.llvm;
-    clang = pkgs.llvmPackages_13.libcxxClang;
-in piston.mkRuntime {
-    language = "llvm_ir";
-    version = clang.version;
-
-    aliases = [
-        "llvm"
-        "llvm-ir"
-        "ll"
-    ];
-    
-    compile = ''
-        ${pkg}/bin/llc "$@" -o binary.s
-        ${clang}/bin/clang binary.s -o binary
-    '';
-    
-    run = ''
-        shift
-        ./binary "$@"
-    '';
-
-    tests = [
-        (piston.mkTest {
-            files = {
-                "test.ll" = ''
-                    @.str = private unnamed_addr constant [2 x i8] c"OK"
-                            
-                    declare i32 @puts(i8* nocapture) nounwind
-
-                    define i32 @main() {
-                        %cast210 = getelementptr [2 x i8],[2 x i8]* @.str, i64 0, i64 0
-
-                        call i32 @puts(i8* %cast210)
-                        ret i32 0
-                    }
-                '';
-            };
-            args = [];
-            stdin = "";
-            packages = [];
-            main = "test.ll";
-        })
-    ];
-}
\ No newline at end of file
diff --git a/runtimes/mono-basic.nix b/runtimes/mono-basic.nix
deleted file mode 100644
index ecafd3c..0000000
--- a/runtimes/mono-basic.nix
+++ /dev/null
@@ -1,47 +0,0 @@
-{pkgs, piston, ...}:
-let
-    pkg = pkgs.mono;
-in piston.mkRuntime {
-    language = "basic";
-    version = pkg.version;
-    runtime = "mono";
-
-    aliases = [
-        "vb"
-        "mono-vb"
-        "mono-basic"
-        "visual-basic"
-    ];
-
-    compile = ''
-        rename 's/$/\.vb/' "$@" # Add .vb extension
-        ${pkg}/bin/vbc -out:out -sdkpath:${pkg}/lib/mono/4.8-api *.vb
-    '';
-
-    run = ''
-        shift
-        ${pkg}/bin/mono out.exe "$@"
-    '';
-
-    tests = [
-        (piston.mkTest {
-            files = {
-                "test.vb" = ''
-                    Imports System
-
-                    Module Module1
-
-                        Sub Main()
-                            Console.WriteLine("OK")
-                        End Sub
-
-                    End Module
-                '';
-            };
-            args = [];
-            stdin = "";
-            packages = [];
-            main = "test.vb";
-        })
-    ];
-}
\ No newline at end of file
diff --git a/runtimes/node-coffeescript.nix b/runtimes/node-coffeescript.nix
deleted file mode 100644
index 8f006ea..0000000
--- a/runtimes/node-coffeescript.nix
+++ /dev/null
@@ -1,57 +0,0 @@
-{pkgs, piston, ...}:
-let
-    pkg = pkgs.nodePackages.coffee-script;
-in piston.mkRuntime {
-    language = "coffeescript";
-    version = pkg.version;
-    runtime = "node";
-
-    aliases = [
-        "coffee"
-    ];
-
-    run = ''
-        ${pkg}/bin/coffee "$@"
-    '';
-
-    tests = [
-        # stdout test
-        (piston.mkTest {
-            files = {
-                "test.coffee" = ''
-                    console.log "OK"
-                '';
-            };
-            args = [];
-            stdin = "";
-            packages = [];
-            main = "test.coffee";
-        })
-
-        # args test
-        (piston.mkTest {
-            files = {
-                "test.coffee" = ''
-                    console.log process.argv[2]
-                '';
-            };
-            args = ["OK"];
-            stdin = "";
-            packages = [];
-            main = "test.coffee";
-        })
-
-        # stdin test
-        (piston.mkTest {
-            files = {
-                "test.coffee" = ''
-                    process.stdin.on('data', (data) => console.log(data.toString()))
-                '';
-            };
-            args = [];
-            stdin = "OK";
-            packages = [];
-            main = "test.coffee";
-        })
-    ];
-}
\ No newline at end of file