OpenDarkEngine

But obviously portability is a minor (though primary) concern. Of course most systems today are more than capable of handling the demands of the dark engine. Including my linux system (an old dimension b110, which has no new graphics card in it: just a intel gma chipset), which used to run thief 2 perfectly as a windows system, but linux does poorly with directx emulation, so you know...

Also, about movie playback: I looked at the video sizes in my main thief 2 folder, and I freaked out at how large the videos were in comparison to the game itself. Now, this is a wee too ahead of the primary concerns, but what is the ideal codec and video format you plan on giving support for?