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[680 users on Ohloh]
The K Desktop Environment (KDE) is a graphical desktop, a set of applications and a development platform. It is created by a community of people dedicated to create a free and user-friendly computing experience. KDE offers all necessary means to easily build all kinds of applications upon.

KDE has been around since 1996, with code change history dating back at least to 1997.

KDE is one of the biggest free software C++ project around and one of the two leaders of unix desktops.

[223 users on Ohloh]
Qt is a cross-platform application and UI framework. Using Qt, you can write applications once and deploy them across many desktop and embedded operating systems without rewriting the source code.
The MacPorts Project
[148 users on Ohloh]
The MacPorts Project's main goal is to provide an easy way to install various open-source software products on the Darwin OS family (OpenDarwin, Mac OS X and Darwin)

There are currently about 5600 completed and usable ports, with more being added on a regular basis.

KDElibs (KDE)
[145 users on Ohloh]
The KDE libraries, basis of KDE and used by many open source projects. They are based on Qt, Trolltech's cross-platform toolkit, and run on Linux, BSDs, and other Unices, as well as Microsoft Windows and Mac OS X.

Licensed under GNU LGPL, they may be used by open source and proprietary applications.

[111 users on Ohloh]
ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files. The clever part about this: ScummVM just replaces the executables shipped with the game, allowing you to play them on systems for which they were never designed!

ScummVM lets you run these adventures: Adventure Soft's Simon the Sorcerer 1 and 2; Revolution's Beneath A Steel Sky, Broken Sword 1 and Broken Sword 2; Flight of the Amazon Queen; Wyr...

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.
Open Komodo
[38 users on Ohloh]
The OpenKomodo Open Source Development Environment for Dynamic Languages and Web Technologies

The Open Komodo project provides a code base upon which integrated development environment (IDE) software packages can be developed. ActiveState's Komodo Edit 4.3 and later (an open source, multi-platform, multi-language editor) is an established, mature product that uses the Open Komodo platform.

With the Open Komodo Project, the focus is on dynamic languages and the open web. Open Komodo i...

[20 users on Ohloh]
Perl Application Development and Refactoring Environment

A Perl IDE written in Perl

[19 users on Ohloh]
KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
[18 users on Ohloh]
libdmtx is a software library that enables programs to read and write Data Matrix 2D barcodes. It runs natively on several platforms, and can be accessed by multiple languages. The package also provides fully featured command line utilities.
Openwall - John the Ripper
[15 users on Ohloh]
John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches.
[12 users on Ohloh]
Bcfg2 helps system administrators produce a consistent, reproducible, and verifiable description of their environment, and offers visualization and reporting tools to aid in day-to-day administrative tasks.
Komodo Edit 4.3 and later
[9 users on Ohloh]
Focus on what your code can do; let your editor sweat the details.

Komodo Edit offers sophisticated support for all major scripting languages, including in-depth autocomplete and calltips, multi-language file support, syntax coloring and syntax checking, Vi emulation, and Emacs key bindings.

Komodo Edit is built on the Mozilla code base and versions 4.3 and later are licensed under the same terms as Firefox: Mozilla Public License (MPL), GNU General Public License (GPL), and GNU Le...

S.C.O.U.R.G.E.: Heroes of Lesser Renown
[9 users on Ohloh]
S.C.O.U.R.G.E. is a Rogue-like game with a modern user interface. The game allows a group of four characters to search for treasure, kill enemies, gain levels, etc.
[7 users on Ohloh]
Kadu is a dynamically evolving instant messenger compatible with the Gadu-Gadu protocol. It can be run on all platforms supporting the Qt toolkit.
[4 users on Ohloh]
PHP-Qt is a language binding for Qt that allows you to write Qt application with the PHP language. Its goal is being a base and supplement for further bindings such as Akonadi, Plasma and other KDE related software as well as enabling PHP developers to write desktop applications.

PHP version 5, with its new object oriented features, turned into a language that can be used for writing desktop software. A widely believed legend says PHP is a web-oriented language, but in truth the language i...

Bastille-Unix (aka Bastille Linux)
[3 users on Ohloh]
Bastille Unix is a Hardening and Reporting/Auditing Program which enhances the security of a Unix box, by configuring daemons, system settings and firewalling. It currently functions on HP-UX, Red Hat, SuSE, Gentoo, Mandrivia, and OSX
dlib C++ Library
[3 users on Ohloh]
This project is a modern C++ library with a focus on portability and program correctness. It strives to be easy to use right and hard to use wrong. Thus, it comes with extensive documentation and thorough debugging modes. The library provides a platform abstraction layer for common tasks such as interfacing with network services, handling threads, or creating graphical user interfaces. Additionally, the library implements many useful algorithms such as data compression routines, linked lists, bi...
Open-source REBOL Can be Achieved
[2 users on Ohloh]
ORCA is an interpreter for a REBOL-like language. The interpreter is a C library so that C/C++ applications can use ORCA as an embedded scripting system. ORCA stands for Open-source Rebol Can be Achieved.
Mosaic Project
[2 users on Ohloh]
Multiplatform music player