Universal server
Free Lock Manager
Is a web server for all Web Developers and Web Designers
apache cookie SSO mechanism.
A national virtual bridge engineering contest for kids of all ages.
Linux for Arduino and Makers developers
OpenMAP Suite is a document management suite based on Subversion
IPsec / IKEv2-based VPN software for Linux.
The Internet of Things
Various TCP/IP servers, clients and network management tools
FireEgl's PuTTY -- FuTTY!
Apache Cayenne, Wicket, CXF, GWT, EJB examples as a framework