OpenGoo is an Open Source Web Office. It is a complete solution for every organization to create, collaborate, share and publish all its internal and external documents.
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.
Entertainer aims to be a simple and easy-to-use media center solution for the Gnome and XFce desktop environments. Entertainer is written completely in Python using an object-oriented programming philosophy. It uses GStreamer's multimedia framework for multimedia playback. The user interface is implemented with the Clutter library, which allows sleek OpenGL animated user interfaces. Entertainer also uses other great projects like SQLite, pyIMDBb and iNotify.
SAPID CMF (Content Management Framework) is a framework for rapid creation of content-based Web 2.0 applications. SAPID CMF allows users to effectively organize new applications' data, structures, representations and functionality components (separation of concerns), with the added efficiency of reusable interface design.
The Xiph.Org Foundation is a non-profit corporation dedicated to protecting the foundations of Internet multimedia from control by private interests. Our purpose is to support and develop free, open protocols and software to serve the public, developer and business markets.
OxygenOffice Professional (OOOP, O2OP) is an enhanced version of free OpenOffice.org what is a multi-platform office productivity suite. OxygenOffice Professional contains more extras like templates, cliparts, samples, fonts and VBA support.