A long-dead (2003) encrypted Peer-to-Peer networking / groupware tool for Windows. Open-source, GPL'd and Firewall-friendly platform for file sharing and more. WASTE and Skype has largely picked up the tab on most of this program's capabilities. Hopefully someone will take the code and use it elsewhere.
Although classified on SourceForge's site as a mature program, limited testing by iA regulars has shown serious bugs during installation (to the effect that it does not actually install).