"Ekiga (formely known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
It supports HD sound quality and video up to DVD size and quality."
LogicalDOC is a powerful DMS at the same time effective and easy-to-use. It can mange office documents in most popular formats such as PDF, OpenOffice, Microsoft Office and so on. With LogicalDOC a working group can work on documents with Versioning, Articles on documents, Messaging features and keyword Tags.
GTD-Free is personal TODO/action manager inspired by GTD (Getting Things Done) method by David Allen. GTD-Free tries to be simple and easy to use management tool. GTD-Free is free open-source software.
Article Writing & Guestpost
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free, opensource IDE (Integrated Development Environment) for MS Windows, Mac OsX, Linux, Solaris and FreeBSD. It is a feature-full, plugin extendable IDE for C/C++ and other programing languages. It is based on KDevPlatform, KDE and Qt libraries and is under development since 1998.
"Free, easy to setup wikis, blogs, forums and many other web applications that you can run locally or in the cloud. BitNami makes deploying server software a simple and enjoyable process. "
MythTV is a homebrew PVR project that I've been working on in my spare time. It's been under heavy development since April 2002, and is now quite useable and featureful.