WinMerge is a tool for visual difference display and merging, for both files and directories. It is highly useful for determing what has changed between file versions, and then merging those changes. WinMerge has Unicode support, Flexible syntax coloring editor, Visual SourceSafe integration, and Windows Shell integration. Regexp filtering for filenames and lines. Side-by-side line difference and highlights differences inside lines. A file map shows the overall file differences in a location pane. The user interface is translated into several languages....

Cheetah is a Python-powered template engine and code generator. It can be used as a standalone utility or it can be combined with other tools. Web developers are its principle user group, but it has many potential uses and is also being used to generate C++ game code, Java, SQL, form emails, and even Python code....

A cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.

SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains unofficial support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2....

Jetty is an Open Source HTTP Servlet Server written in Java. It is a full featured HTTP/1.1 server and a Servlet container. It is designed to be small, fast, embeddable and extensible. It supports HTTP/1.1, servlet, SPDY, websockets, and JSP.

Bison is a general-purpose parser generator that converts an annotated context-free grammar into an LALR or GLR parser for that grammar. Once you are proficient with Bison, you can use it to develop a wide range of language parsers, from those used in simple desk calculators to complex programming languages....

gedit is the official text editor of the GNOME desktop environment.

While aiming at simplicity and ease of use, gedit is a powerful general purpose text editor that among other things features a flexible plugin system which can be used to dynamically add new advanced features in C or Python...

KDE PIM is sub project of KDE. Its goal is to provide an application suite to manage personal information. This includes mail, time, people and more. The main result is KDE Kontact, our personal information manager.

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.

xmonad is a tiling window manager for X. Windows are arranged automatically to tile the screen without gaps or overlap, maximising screen use. All features of the window manager are accessible from the keyboard: a mouse is strictly optional. xmonad is written and extensible in Haskell. Custom layout algorithms, and other extensions, may be written by the user in config files. Layouts are applied dynamically, and different layouts may be used on each workspace. Xinerama is fully supported, allowing windows to be tiled on several screens....

Compiz is a compositing window manager that uses 3D graphics acceleration via OpenGL. It provides various new graphical effects and features on any desktop environment, including Gnome and KDE. (Short version: Wobbly windows and stuff)