Open Source
Links
Apache Software Foundation
Apache is the open-source internet software foundation most famous for the Apache HTTP server - probably the most prevalent web-server in the world.
Weberdev
Weberdev is comprehensive collection of PHP and MySQL resources, code examples, articles and development news.
Eclipse.org
The Eclipse Platform is an open extensible IDE for anything and yet nothing in particular. The Eclipse Platform provides building blocks and a foundation for constructing and running integrated software-development tools. The Eclipse Platform allows tool builders to independently develop tools that integrate with other people's tools so seamlessly you can't tell where one tool ends and another starts.
Kaffe.org
Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment. The Kaffe virtual machine is free software, licensed under the terms of the GNU Public License.
Zope
Zope is a leading open source application server, specializing in content management, portals, and custom applications. Zope enables teams to collaborate in the creation and management of dynamic web-based business applications such as intranets and portals.
Search Enterprise Linux
http://searchenterpriselinux.techtarget.com
Linux specific search engine/portal for IT pros. Includes tips and online chat with Linux professionals.
Enhydra
The Enhydra.org project is similar to Apache, but with a focus on E-Business software revolving around the application server. It now consists of thousands of developers and committers from over 50 countries.
OpenSource.org
Resources site for the Open Source Initiative. The site explains how to create and license OSI certified software products.
DotGNU Project
DotGNU is a Free Software project to create a platform for webservices that can be written in a variety of different programming languages including Java and C#.