Marius Matux
Open your mind, open your heart, open your sources. Instructions on How to Install Gentoo Linux on a Compaq Armada m700.
http://www.matux.de/

Kaarst - KaaLUG
Joomla! - dynamische Portal-Engine und Content-Management-System
http://www.kaalug.de

Open Motif Everywhere
ICS's Open Motif built from the official Open Group sources. Precompiled binaries available on all popular Linux environments and FreeBSD.
http://www.motifzone.net/

The Open Technology Portal
The itmWEB Site™ is one of the largest specialized Information Technology sites on the Internet. It contains hundreds of pages of resources, papers, and links about eBusiness concepts, systems development, and project management.
http://www.open-technology.com/

Open-EIS
Das open-EIS (Enterprise Informationssystem) ist ein modulares Portal Server System für Wissensmanagement, eLearning, Kommunikation und Web Content Management in den Bereichen eBusiness, eCommerce und eGovernment unter Linux/ Unix und Windows.
http://www.open-eis.com

IOSA - Internet and Open Source in Archaeology
Promotes the use of open source software and open stardards in archaeological computing.
http://www.iosa.it

Open Sources: Voices from the Open Source Revolution
In Open Sources, leaders of Open Source come together in print for the first time to discuss the new vision of the software industry they have created, through essays that explain how the movement works, why it succeeds, and where it is going. A powerful...
http://www.oreilly.com/catalog/opensources/

Open Runtime Platform
The world's largest development and download repository of Open Source code and applications
http://sourceforge.net/projects/orp/

JetSpeed
Servlet implementation of an open protocol GroupWare product. The backend (search engines, news, weather, POP3/IMAP/LDAP/NNTP, database) will be based on other open source packages. [Open Source, BSD-like]
http://portals.apache.org/jetspeed-1/

Open Source Initiative
Dedicated to managing and promoting the Open Source trademark for the good of the community. Includes a definition of 'Open Source', and a list of approved licenses.
http://www.opensource.org/