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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,...).
GNU findutils
[852 users on Ohloh]
GNU findutils includes find, xargs, locate and updatedb. These tools proivide ways to search for files on your system by specifying what kind of file you're looking for.
[520 users on Ohloh]
curl is a command line tool for transferring files with URL syntax, supporting FTP, FTPS, TFTP, HTTP, HTTPS, SCP, SFTP, TELNET, DICT, FILE and LDAP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos...), file transfer resume, proxy tunneling and a busload of other useful tricks.
[470 users on Ohloh]
MediaWiki is the collaborative editing software that runs Wikipedia, the free encyclopaedia, and other projects. It's designed to handle a large number of users and pages without imposing too rigid a structure or workflow.
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.
[349 users on Ohloh]
Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors) and to some extent PHP, C#, and D.

Doxygen is developed under Linux and Mac OS X, but is set-up to be highly portable. As a result, it runs on most other Unix flavors as well. Furthermore, executables for Windows are available.

GNU Parted
[186 users on Ohloh]
GNU Parted is an industrial-strength package for creating, destroying, resizing, checking and copying partitions, and the file systems on them. This is useful for creating space for new operating systems, reorganising disk usage, copying data on hard disks and disk imaging.
[132 users on Ohloh]
Libxml2 is the XML C parser and toolkit developed for the Gnome project (but usable outside of the Gnome platform).

Includes the xmllint tool for checking documents for well-formedness, validating documents against a DTD or XML Schema, and pretty printing XML input.

KDevelop IDE
[107 users on Ohloh]
The KDevelop project was founded in 1998 to build up an easy to use IDE (Integrated Development Environment) for KDE. Since then, the KDevelop IDE is publicly available under the GPL and supports many programming languages.
[100 users on Ohloh]
Freeciv is a free turn-based multiplayer strategy game, in which each player becomes the leader of a civilization, fighting to obtain the ultimate goal:

To become the greatest civilization.

[67 users on Ohloh]
Rockbox is an open source replacement firmware for portable music players. It runs on a wide range of different models.
Apache Xerces C++
[48 users on Ohloh]
Xerces-C++ is a validating XML parser written in a portable subset of C++. A shared library is provided for parsing, generating, manipulating, and validating XML documents. Xerces-C++ is faithful to the XML 1.0 recommendation and many associated standards. Source code, samples and API documentation are provided with the parser. For portability, care has been taken to make minimal use of templates, no RTTI, and minimal use of #ifdefs.
[39 users on Ohloh]
PROJ.4 - Cartographic Projections library
[38 users on Ohloh]
ANother Tool for Language Recognition (ANTLR) is the name of a parser generator that uses LL(k) parsing. ANTLR is the successor to the Purdue Compiler Construction Tool Set (PCCTS), first developed in 1989, and is under active development. Its maintainer is professor Terence Parr of the University of San Francisco.
Pardus Linux
[38 users on Ohloh]
Pardus is GNU/Linux distribution developed by TUBITAK/UEKAE according to computer literates' basic desktop needs; uses existing distributions' dominant parts as concept, architecture or code; provides easy use, configuration, installation with configuration environment and tools that can be converted to an autonomous system.
[37 users on Ohloh]
GTK+ frontend to su and sudo
The LLVM Compiler Infrastructure
[36 users on Ohloh]
LLVM is a robust system, particularly well suited for developing new mid-level language-independent analyses and optimizations of all sorts, including those that require extensive interprocedural analysis. LLVM is also a great target for front-end development for conventional or research programming languages, including those which require compile-time, link-time, or run-time optimization for effective implementation, proper tail calls or garbage collection. We have an incomplete list of project...
Sphinx documentation builder
[33 users on Ohloh]
Sphinx is a tool that makes it easy to create intelligent and beautiful documentation for Python projects.
[29 users on Ohloh]
Seahorse is a GNOME application for managing encryption keys. It also integrates with nautilus, gedit and other places for encryption operations.
LLVM/Clang C family frontend
[28 users on Ohloh]
The goal of this work is to provide a high quality front-end for LLVM that is built with the same principles as the rest of LLVM (it is built as a set of reusable libraries, integrates well with rest of the LLVM architecture, same license, etc). Among other things, this means that LLVM can now be used for a variety source-level analysis and transformation tasks that it was not suitable for before.