Tower of Doom
Tower of Doom is one of the few roguelikes that are based on a futuristic theme, and even a dark one. It uses complex RPG-based rules and has many interesting features.
Versions and platforms
Latest Tower of Doom version is 0.3.1, released on April 1st, 2005. Tower of Doom is available for Windows; its source code is freely available and builds on Linux, too.