OpenLubbs - Light Usable Bulletin Board System. An Open Source version of the original text BBS used at Lancaster University, UK. The goal is to improve the code and make it web based. The project is not affiliated or endorsed by Lancaster University.
A mailing service code written in JAVA where users can mail content without logging in their respective email ids. Very useful for organizations with high security.
Communication protocol for advanced clients of talker Atlantis (now running at atlantis.talker.sk). No implementation. No sourcecode. Only specfication.
Python-Talk is a Python implementation of a talker environment, such as Elsewhere-Too (aka ewtoo). It is a new and innovative style of talker, with easy to understand code.
Rock: Crashed Plane (R2) (http://www.dillfrog.com/games/r2/) is an open source multi-user dungeon (dimension, or sometimes domain) coded in the perl programming language and licensed under the GNU General Public License.
The majority of the code was open-sourced as a courtesy when the original server was taken offline. The codebase is largely abandoned, and has not been updated to follow best practices.