pureIRCd is an IRC Server written C (though throughout the years i've used various programming languages, including VB6, VB.net C#, and am now stuck with C) to provide a fresh IRC (RFC1459) implementation and avoid the clutter of existing solutions.
Aggilus is a true messaging server, with email, IRC, newsgroups, instant messaging, and much more. Do not apply to join, discuss in the forums, you may be invited.
Programming must be done in Visual Basic, and all functionality must be in COM+.
TCP-Communication framework
Helps developers develop network communication applications,
without the hazzle of learning TCP-Socket API programming.
For ex to develop chatservers/clients as easy as using the winsock component
if not even easier.
The TinyIDE project is an attempt to create a new MUSH client for coders in TinyMUSH, PennMUSH, etc. This will feature code formatting, object browsing, and general MUSH client functionality.