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Nuitka is a Python compiler written in Python. It's fully compatible with Python 2.6, 2.7, 3.4-3.14. You feed it your Python app, it does a lot of clever things, and spits out an executable or extension module.
jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams. The JDK 8's main efforts (default methods, lambdas, and the Stream API) were focused around maintaining backwards compatibility and implementing a functional API for parallelism.
A pure c# implementation of Lua 5.2 focus on compatibility with Unity
A compatibility layer for event-driven abstractions
Delegate-based C# P/Invoke alternative - compatible with all platforms and runtimes.
A scripting language for .NET Core
Pattern Matcher Compatible with Optima
SquirrelJME is a Java ME 8 Virtual Machine for embedded and Internet of Things devices. It has the ultimate goal of being 99.9% compatible with the Java ME standard.
A simple, flexible, extensible, and liberal RSS and Atom reader for Ruby. It is designed to be backwards compatible with the standard RSS parser, but will never do RSS generation.
Modern CSS to all browsers
Less language is an extension of css and less4j compiles it into regular css. Less adds several dynamic features into css: variables, expressions, nested rules, and so on. Less was designed to be compatible with css and any correct css file is also correct less file.
XPath/XQuery 3.1 interpreter for Pascal with compatibility modes for XPath 2.0/XQuery 1.0/3.0, custom and JSONiq extensions, pattern matching, XML/HTML/JSON parsers and classes for HTTP/S requests
Static & dynamic D bindings to SDL and the SDL_* libraries, compatible with BetterC, @nogc, and nothrow. (Mirror)
CrossPascal aims to be a Delphi 7 compatible cross-platform source-to-source compiler which generates intermediate C code.
The universal ISSR server compatible with <your-favorite-programming-language>
Dynamic D bindings to OpenGL, compatible with BetterC, @nogc, and nothrow.
Static & dynamic D bindings to GLFW, compatible with BetterC, @nogc, and nothrow.
Automatically makes package.json projects (such as npm packages and node.js modules) compatible with Deno.
OCaml bindings to PCRE (Perl Compatibility Regular Expressions)
A compatible re-implementation of the BibTeX program in Common Lisp, with a BST-to-CL compiler. By Matthias Köppe
Javascript recursion schemes compatible with flow-static-land
A library for verifying graph-manipulating programs. Powered by Coq and VST. Compatible with CompCert.
Static & dynamic D bindings to the FreeType library, compatible with BetterC, @nogc, and nothrow.
Clojure-compatible threading/transformation/arrow macros for Common Lisp