TelnetDoor is a BBS door that SysOps can use to allow their users to remotely connect to other servers (of the SysOps choosing). It was quickly written by request, and I haven't really tested it much, but it seems to do the trick.
While the door is called TelnetDoor, it actually supports creating RLogin connections as well.
Download TelnetDoor (files are in bin/Release)
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Or how about IOTA?