INSTEAD - Simple Text Adventure Interpreter.
a (simple) Sokoban game
A cross-platform, multimedia interpreter for TADS adventure games.
Commander Keen Interpreter
Old-School Console Game
A cross-platform interpreter for many point-and-click adventure games
GGMud is a cross platform modern MUD client.
A cross-platform, 3D interpreter to play LucasArts' Lua-based games
A modern "graphics" API for text-based applications
Yet Another Chess ENgine
Cross-platform reimplementation of AMOS BASIC (runtime)
AMOS BASIC reimplementation in Java
Morse Coder / Encoder
GlowMuck is a multi-user text-based role-play platform, a MUD server.