Uldramar is a fantasy RPG and adventure game. You can cast spells like the mushroom morph spell and pick up objects for later use.
Ultima Iris is a 3D game client for the popular Massive Multiplayer Role Playing Game "Ultima Online" (tm). Adding a third dimension to the well-known Ultima Online World, Iris allows the player to navigate the gaming environment just like any modern 3d rpg and still retain the unique roleplaying experience that only classic Ultima can provide.
Umbra is a computer role-playing game written in Python. The world is randomly-generated for new play every time, but there is an eventual goal and storyline.
Unangband is a variant of Angband that has a distinct flavor. You adventure in Tolkien's world, through towns and wilderness and multiple dungeons, journeying from Bree towards greater and greater danger. This variant roughly doubles the monster list, expands the class-based system of Angband with numerous possible specialties that let you fashion a unique character, offers an absurd variety of terrain, and includes a bunch of major interface improvements, including better presentation of graphics and an experimental isometric view.
UnNetHack is a variant of the hugely popular roguelike game NetHack. It features more monsters, more levels, more items, more perils, more challenges, and more fun than vanilla NetHack.
VCS is a visual d20 3.5 combat program for dungeon masters. If you have dual monitors, one can show the DM map and the other the players.
violetland is an open source cross-platform game similar to Crimsonland, a no holds barred action game with no nonsense. Read more
Warlock Front End
The Warlock Front End is written to allow Simutronics games to be played in Linux, Mac OS, and Windows. The primary focus at this time is on Dragonrealms, but other Simultronics games work to varying degrees.
Windy City Pains CRPG
Windy City Pains is an over-ambitious undertaking which uses the engine to emulate guns rather than magic (from the target's point of view, there's not much difference). There are a lot of fights, some of which are serious in their place, a few more bits of artwork, and a lot of wandering about to get things.
Wolfpack is a server-side Ultima Online MMORPG software. The project has started back in 1998 and has aquired both users and developers since then.
xBaK is a fan-made remake of the classic Sierra computer RPG "Betrayal at Krondor" running on linux. xBaK is basicly a game engine, that uses the data files that came with the original game by Sierra Online.
XU4 is a remake of the computer game Ultima IV. The goal is to make it easy and convenient to play this classic on modern operating systems. XU4 is primarily inspired by the much more ambitious project Exult. XU4 is a cross-platform application thanks to SDL; it's available for Windows, MacOS X, Linux and more.
Xutumno is an XWindow port of Utumno, which is a graphical, real-time, roguelike.
Yet Another Dungeon-game
YAD is a maze (or dungeon) game with a flexible text-based map format and interface plugins.
You Only Live Once
You Only Live Once is a rogue-like game in which you are represented by an @ which moves through a world populated by ASCII characters. The goal of this game is to tell a simple story.
ZAngband is a single-player rogue-like dungeon exploration game that runs on a wide variety of computer systems.