OpenXP 5 - a multi-protocol offline mail and news reader
...OpenXP 5 is capable of establishing TLS encrypted connections to POP3, IMAP, SMTP and NNTP based servers and supports the new IPv6 protocol.
see:
http://de.wikipedia.org/wiki/CrossPoint
http://svn.code.sf.net/p/openxp5/code/doc/Crosspoint_Versions.pdf
http://groups.google.com/forum/#!forum/de.comm.software.crosspoint
FIDOGATE is a Fido-Internet gateway, a Fido FTN-FTN NetMail gateway, a Fido tosser, a Fido file processor/ticker, and a Fido Areafix/Filefix program
(The latest code is in CVS but a GIT repository is being prepared.)
AUXChat has died, the source was lost, and the project was not finished. A rewrite is under way, and as soon as some code is anywhere near functional, this site will be updated.