Xenoterra is a Freeware Windows-Compatible BBS system with hooks for both dial-in and TCP/IP connections.

I was able to find mentions of work on Xenoterra by Spellweaver as early as 1996. Work was done on a API for doors for Xenoterra as well. The version in this entry is a 1.00 beta released on 1999 and is the only available copy. The website for Xenoterra includes information that a further release is due in 2004; considering the software is first mentioned in May of 1996, a release happens in 1999, and the next possibility of a release if five years later, the schedule for this software is slow indeed.