The XL Engine, a game engine designed to run enhanced remakes/ports of classic game titles, is being ported to Linux. Not only does this run ports of classic games, but at the same time there's visual improvements, this cross-platform capabilities, greater support for mods, and other reported benefits.
Among the XL Games using this engine are The Elder Scrolls II: Daggerfall, Star Wars: Dark Forces, Blood, and Outlaws. These are popular DOS-era titles from the 1990's but have been adapted to run on the XL Engine.
Details on the Linux client port and other ongoing work with the XL Engine can be found via
their development blog.