Category/Programming-language

4tH

Forth compiler with a conventional compiler instead of the standard Forth engine

A Bingo

A/Bingo plugin for Rails.

A+

Programming language (APL interpreter)

ACDK

Java-like C++ framework with scripting and distributed components

ACL2

Programming language for modelling computer systems and proving properties of those models

ADG: Automatic Drawing Generation

A library focused on automating the drawing of mechanical parts.

Access user Class

Easy to use PHP class to protect pages and register new users

Action Mailer

a framework for designing email-service layers.

Action Query

jQuery and ActiveRecord, sitting in a tree...

Active Resources

provides a coherent wrapper object-relational mapping for REST web services.

Acts as Audited

an ActiveRecord extension that logs all changes to your models in an audits table.

Acts as fu

When you need a dash of ActiveRecord and nothing more.

Ada Components

Toolset for Ada

Ada Motif binding library

Binding to X Windows and OSF/Motif for the Ada programming language

AdaDoc

Documentation tool for Ada

AdaSockets

Allows for use of sockets in Ada95

AdaUnits

Implementation of dimensioned values for Ada

AdacURL

Ada95 binding to the 'cURL' library

Agile Toolkit

Agile Toolkit is a powerful web development framework.

Airtime

Free software radio automation software

Algol 68 Genie

A fairly fully featured Algol 68 interpreter

Amnesia

A Sinatra app that presents memcached server stats.

Anemone

An easy-to-use Ruby web spider framework

Anki

A spaced repetition flashcard program.

Antidote

IEEE 11073-20601 stack

Apache OpenOffice

A free office-document productivity suite providing six powerful applications

Apydia

API Reference Documentation Generator for Python.

AsmEdit

Editor and IDE written in assembler

AsmRef

Reference for x86 assembly language programmers

Asset Trip

Rails asset bundling plugin that will expand your mind.

Association Freezer

Freeze a belongs_to association in Active Record.

Atrack

A Tracker for Google's App Engine

Avrotest

arbitrary performance test between avro and thrift.

Awesome

a Redis implementation in node.js

BFFFT

Fortran 90 2D Vectorized Fast Fourier Transform

BRL

Language for server-side Web applications

BRL-CAD

Is a powerful Constructive Solid Geometry (CSG) solid modeling system

BWidget Toolkit

High-level widget set for Tcl/Tk

Babel

a collection of tools for internationalizing Python applications.

Bacon

a small RSpec clone.

Badger

a library used to generate badge sheets for events.

Bakery

C++ framework for creating GNOME applications

Barista

transparent coffeescript support for rails 3

Beanstalkc

a simple beanstalkd client library.

Bff

BrainF*ck language interpreter

Bfloop

An interpreter for the BLooP and FLooP programming languages.

Bibfilex

Free software useful to create and to manage archives of bibliographical items according to Biblatex structure and rules.

BibleTime

A Bible study software

Biferno

Scripting language for web development

BigFORTH

Forth compiler

Bigloo

Implementation of the Scheme programming language

Bitstring

Simple construction, analysis and modification of binary data.

Bitten

a simple distributed continuous integration system.

Bmrblib

The Biological Magnetic Resonance Data Bank (BioMagResBank or BMRB) library

Booleano

an interpreter of boolean expressions, a library to define and run filters available as text (e.g., in a natural language) or in Python code.

Boost

Portable C++ source libraries.

Bottle

a fast and simple WSGI web-framework for Python.

Bundler

a tool that manages gem dependencies for your ruby application.

Busted

busted is a tool for gathering and reporting information about a broken gem.

C ElementTree

an add-on to the standard ElementTree package.

C to C++ converter

Converts C sources or whole project into C++

C2hs

Simplifies the development of Haskell bindings to C libraries

CMDln

An improved cmd.py for writing multi-command scripts and shells.

CMUCL

Free implementation of Common Lisp

CRCmod

a CRC generator

CSS-parser

Ruby CSS Parser.

CSSPool

a CSS SAC parser and by default will output a DOM Level 2 style tree.

CUnit

A unit testing library for the C language

Cache Money

A Write-Through Cacheing Library for ActiveRecord.

Cachet

An HTTP Cache Proxy in Scala.

Cachy

a library to simplify and organize caching.

Cajo

a small library, enabling powerful dynamic multi-machine coöperation.

Calendar Maker

Rails plugin to build a simple calendar scaffold, with events signified by class names added to the day.

CamlTemplate

Template processor library for Objective Caml

Cancan

Simple authorization for Rails.

Candygram

Python implementation of Erlang concurrency primitives

Capybara

webrat alternative which aims to support all browser simulators.

Carrot

an AMQP messaging queue framework.

Cgipplib

Support classes for building CGI applications

Challis

a lightweight markup language.

Chicago

a collection of runtime and test extensions and helpers.

Chicken

Scheme to C compiler

Choones

A jQuery plugin to provide monologue style messaging.

Cilk

Algorithmic language for multi-threaded parallel processing

Clearance

Rails authentication with email & password.

Clisp

ANSI Common Lisp compiler, debugger, and interpreter

Cloak

A comment extraction and search tool.

CodePY

Generate and execute native code at run time.

CodeTools

Code Analysis and Execution Tools

Coffee Script Lab

little environment for playing with CoffeeScript in the browser.

CoffeeScript

a little language that compiles into JavaScript.

Colfm

A console, column-oriented file manager.

Collab

real-time shared painting software (paint chat)

Colubrid

a simple wsgi publisher.

Comma

a small CSV (ie. comma separated values) generation extension for Ruby objects.

Common Lisp SQL

SQL database interface for Common Lisp

Complex Form Examples

Various ways to handle multi-model forms in Rails.

Complexity

Measure the complexity of C source

Condenser

Findis and removes duplicate Java code

ConfigObj

ultra simple reading and writing of configuration files (ini) for Python.

Configgy

Simple config and logging setup for scala.

Coreboot

Free BIOS replacement

CouchDBKit

a framework to allow your Python application to use CouchDB.

CouchDBlib

a Python library for working with CouchDB.

CouchQL

a SQL-like interface to CouchDB.

Coverage

a tool for measuring code coverage of Python programs.

Coveralls

A rails plugin to make sure all files are required and show up in the code coverage report.

Cp-tools 2

Tools for use with GNU Classpath

Cpphs

Haskell re-implementation of cpp

CrackLib

a password checking library.

Crenshaw Compiler

Ruby port of Crenshaw's "Let's build a compiler!" tutorial.

Cscope

Browses through source code files for specific elements of code.

Ctypes

Library wrapper in Python

Cxcl

Interpreter for the XCLE language

CxxTest

JUnit/CppUnit/xUnit-like framework for C++

Cython

compiler for writing C extensions for the Python language.

DBG-Client

Client for the DBG debugger

DBG-Server

PHP debugger and profiler

Dabo

a 3-tier framework for developing desktop applications.

Dajax

easy to use ajax library for django.

Data.Gov Importer for the National Data Catalog

Import data.gov datasets to the National Data Catalog.

DataStatix

A free software to manage data and statistics with MySql

Decorator

Better living through Python with decorators.

Delayed Job

Database based asynchronously priority queue system.

Deltared

Simple implementation of the DeltaBlue multi-way constraint solving algorithm.

Dia2code-ruby

Generates Ruby from an UML Dia Diagram

Dialtone

A minimalist Ruby web application framework used to demonstrate Rack usage.

Diapergluforth

Testing tool for shared object libraries

Directory Watcher

Event notification for file system changes.

Discodactyl

XRD parsing in Ruby.

Dismal

A major mode for GNU Emacs that implements a spreadsheet.

Djalog

a simple logging module for Django applications.

Django

high-level Python Web framework

Djblets

a collection of useful classes and functions for Django.

DocTestTools

tools to run doctests on code and text files within a directory.

Dogtail

A GUI test tool for python

Downlow

Downloading files on the DL.

Doxymacs

Makes using/creating Doxygen easier for Emacs users

DrPython

Simple editor for Python development

DrScheme

GUI Scheme development environment

DrlFT

Type sensitive preprocessor for Haskell

Dtach

a program that emulates the detach feature of screen.

Dvorky

an android keyboard layout.

Dynamic Asset Helper

Rails plugin providing helpers to dynamically include JS/CSS assets based on routes

ECB

Multilingual source code browser for Emacs

EXcavator

An XML query processing class for PHP.

Easylzma

An easy to use, tiny, public domain, C wrapper library around Igor Pavlov's work that can be used to compress and extract lzma files.

Eclipse

Java-based Integrated Development Environment

Electric

An electrical CAD system

Elegant 2

Programming language

Elib

Library of Emacs LISP functions

EmPy

Embeds Python expressions and statements in template text

Emacs Common Lisp

Common Lisp implementation for Emacs

Encoder Tools

Some tools to make encoding from DVDs easier.

Enotes

Emacs script to handle appointments

Enstaller

A replacement for setuptools that builds on top of it and adds additional features.

EphemPy

Python tools for working with the JPL ephemeris files.

Epsilon

Strongly-typed omega-order programming language

Epydoc

A tool for documenting Python projects

Eric

Is a Python development environment with all batteries included.

Erlang OTP

Soft realtime concurrent/distributed functional language and runtime

Erlectricity

exposes Ruby to Erlang and vice versa.

Escape Utils

Faster string escaping routines for your web apps.

Euphoria

Euphoria Programming Language

Eventdns

An EventMachine based DNS server.

ExtraDix

an extension of the well-known RadixSort (hence its name Extended raDix).

F-Droid

Free software server and client for distributing Android applications

FLVlib

A library for manipulating, parsing and verifying FLV files.

FOX

Toolkit for GUI development

FXRuby

Interface for the FOX GUI toolkit

FactoryGirl

a fixtures replacement with a straightforward definition syntax.

FakeFS

A fake filesystem. Use it in your tests.

Fifty States App

A Django app for viewing Fifty State Project data.

Firestr

Platform for distributed communication and computation

Fiscal Year Calculations

Some helper methods for the Time object for fiscal year calculation.

Flatland

HTML form management and validation.

FlexSURVEY

a small-in-size but powerful tool for creating flexible PHP-driven online surveys

Flexable

template engine with simple data structure.

Follow

Follow class implements "tail -f" functionality to incrementally read text and binary files as they grow.

Forban

a filesharing application for link-local and local area networks.

Forgery

Easy and customizable generation of forged data.

Fortune

a stripped-down implementation of the classic BSD Unix fortune command.

Foursquare

Ruby API for Foursquare (playfoursquare.com)

Freckle API

A basic API client for the Freckle API.

Free Pascal Compiler

Free Pascal compiler

FreeSnell

FreeSnell is a program to compute optical properties of multilayer thin-film coatings.

Frei0r

Minimalistic plugin API for video effects

Fscript

Scripting language intended for use as an embedded language in other Java programs

Ftwalk

Scripting language

Funk

A mocking framework for Python.

FuzzPy

a library for fuzzy sets, fuzzy graphs, and general fuzzy mathematics.

GCL

Compiler and interpreter for Common Lisp

GNADE

Project to create an Ada 95 development environment

GNU Classspathx

Unfinished free implementation of the Java extension libraries

GNU Pascal

Pascal compiler of the GNU Project

GNU R

a language and environment for statistical computing and graphics.

GNU Smalltalk

Implementation of the Smalltalk object oriented language

GNU eev

Emacs support for e-scripts

GNU social

GNU social implements the OStatus standard for decentralized social networking.

GNUbik

3D Rubik's cube game

… further results