Conky is a program which can display arbitrary information (such as the date, CPU temperature from i2c, MPD info, and anything else you desire) to the root window in X11. Conky normally does this by drawing to the root window, however Conky can also be run in windowed mode (though this is not how conky was meant to be used)....

monit is a utility for managing and monitoring processes, files, directories and devices on a UNIX system. monit conducts automatic maintenance and repair and can execute meaningful casual actions in error situations.

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

A chat network to IRC gateway. Currently supports most common IM protocols (plus Twitter microblogging), or all protocols supported by libpurple.

SugarCRM enables sales, marketing, and support organizations to manage their customer interactions more efficiently and profitably and is intended for both large and small companies worldwide. Platform agnostic, SugarCRM is the least complex, most portable, and most cost-efficient customer relationship management (CRM) solution. Natively built on the LAMP (Linux, Apache, MySQL and PHP) stack, Sugar Open Source can be deployed in virtually any environment....

Zimbra - Community Edition is open source server and client software for messaging and collaboration - email, group calendaring, contacts, and web document management and authoring. The Zimbra server is available for Linux, Mac OS X, appliances, and virtualization platforms. The Zimbra Web 2.0 Ajax client runs on Firefox, Safari, and IE, and features easy integration / mash-ups of web portals, business applications, and VoIP using web services....

Foswiki is the next generation of enterprise collaboration suites. With Foswiki, you don't have to be a programmer to collect, store, and re-use enterprise information: everyday users have the power to easily create Web 2.0 applications such as mashups and social interaction tools....

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.

ANother Tool for Language Recognition (ANTLR) is the name of a parser generator that uses LL 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....

KDESvn is a frontend to the subversion vcs. In difference to most other tools it uses the subversion C-Api direct via a c++ wrapper made by Rapid SVN and doesn't parse the output of the subversion client. So it is a real client itself instead of a frontend to the command line tool....