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PHP
[3254 users on Ohloh]
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
GCC, the GNU Compiler Collection
[2157 users on Ohloh]
The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Java, and Ada, as well as libraries for these languages (libstdc++, libgcj,...).
Python programming language
[1662 users on Ohloh]
Python is a dynamic, object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of better code.
Perl
[730 users on Ohloh]
Perl is a general-purpose programming language originally developed for text manipulation and now used for a wide range of tasks including system administration, web development, network programming, GUI development, and more. Its major features include support for multiple programming paradigms (procedural, object-oriented, and functional styles), automatic memory management, built-in support for text processing, and a large collection of third-party modules.
Ruby
[665 users on Ohloh]
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, extensible, and portable.
GNU C Library
[426 users on Ohloh]
The GNU C Library, glibc, provides the standard C library interface for GNU/Linux and other Free Software operating systems.
gettext
[261 users on Ohloh]
gettext is the GNU internationalization (i18n) library. It is commonly used for writing multilingual programs.
Smarty
[219 users on Ohloh]
Smarty is a template engine for PHP. More specifically, it facilitates a manageable way to separate application logic and content from its presentation.
Boost C++ Libraries
[217 users on Ohloh]
Boost was begun by members of the ISO C++ Standard committee Library Working Group to provide free peer-reviewed portable libraries to the C++ community. An additional objective is to establish "existing practice" and provide reference implementations so that the Boost libraries are suitable for eventual standardization.

Components successfully moved into draft ISO Standard C++09 include shared_ptr, regular expressions, function wrappers and binders.

Groovy
[144 users on Ohloh]
An agile dynamic language for the Java Platform with many features that are inspired by languages like Python, Ruby and Smalltalk, making them available to Java developers using a Java-like syntax. Developing web applications , writing shell scripts easily, writing concise, meaningful, test cases using Groovy's JUnit integration, or prototyping and producing real industrial strength applications have never been so concise and groovy.
GHC
[122 users on Ohloh]
Haskell is an advanced purely functional programming language. The product of more than twenty years of cutting edge research, it allows rapid development of robust, concise, correct software. With strong support for integration with other languages, built-in concurrency, debuggers, profilers, rich libraries and an active community, Haskell makes it easier to produce flexible, maintainable high-quality software.

GHC is a state-of-the-art, open source, compiler and interac...

Lua
[94 users on Ohloh]
Lua is a powerful, fast, light-weight, embeddable scripting language.

Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.

Erlang
[81 users on Ohloh]
Erlang is a programming language designed at the Ericsson Computer Science Laboratory. Ericsson released the entire source code of the Erlang system including extensive libraries of code for building robust fault-tolerant distributed applications.
Steel Bank Common Lisp
[65 users on Ohloh]
Steel Bank Common Lisp, aka SBCL, is an open source compiler and runtime system for ANSI Common Lisp. It provides an interactive environment including an integrated native compiler, a debugger, and many extensions.
JRuby
[53 users on Ohloh]
JRuby is an 100% pure-Java implementation of the Ruby programming language.

JRuby is the effort to recreate the Ruby interpreter in Java. JRuby is tightly integrated with Java to allow both to script any Java class and to embed the interpreter into any Java application.

Poedit
[48 users on Ohloh]
Poedit is cross-platform gettext catalogs (PO files) editor which runs on Unix, Windows and Mac OS X. Unlike other editors, Poedit provides compact view of data and very effective UI.
Parrot
[45 users on Ohloh]
Parrot is a virtual machine designed to efficiently compile and execute bytecode for dynamic languages. Parrot currently hosts a variety of language implementations in various stages of completion, including Tcl, Javascript, Ruby, Lua, Scheme, PHP, Python, Perl 6, APL, and a .NET bytecode translator. Parrot is not about parrots, though we are rather fond of them for obvious reasons.
Scala
[44 users on Ohloh]
Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages. It is also fully interoperable with Java.
SWIG
[43 users on Ohloh]
SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. SWIG is primarily used with common scripting languages such as Perl, PHP, Python, Tcl/Tk, and Ruby, however the list of supported languages also includes non-scripting languages such as C#, Common Lisp (CLISP, Allegro CL, UFFI), Java, Modula-3, and OCAML. Also several interpreted and compiled Scheme implementations (Guile, MzScheme, Chicken) are supported. SWIG is m...
Boo Programming Language
[41 users on Ohloh]
A wrist-friendly language targeting the Common Language Runtime (.NET / Mono) with an extensible compiler pipeline, a syntax reminiscent of Python, and many other features (like type inference, syntactic macros, etc.)