tn5250 emulates a 5250 terminal or printer over telnet, for connecting to IBM Power Systems, iSeries and AS/400 computers running IBM i, i5/OS and OS/400. It runs on any Unix or Windows system.
Note that this project is now on GitHub at https://github.com/tn5250/tn5250
RTelnet is a reverse Telnet, it's increadably useful to get behind firewalls and NAT's or routers running ip masqurading.
very useful for remotely admin someones PC remotely when they don't know how to do anything like opening their firewall.
PCMan is an easy-to-use telnet client mainly targets BBS users formerly running under MS Windows. PCMan X is a newly developed, open-source and cross-platform version written with wxWidgets, supporting X Window, MS Windows, and Mac OS X.
Communication protocol for advanced clients of talker Atlantis (now running at atlantis.talker.sk). No implementation. No source code. Only specfication.