To date, the only major Unigine Engine title to ship with a native Linux client is OilRush, which is a title by Unigine Corp themselves rather than a licensee. There's also been games like Tryst, Syndicates of Arkon, and Petshop released, but the developers have gone without providing any Linux binaries.
Among the upcoming titles are Cradle, Dilogous: The Winds of War, and MMT Online. Sadly though, there hasn't been too much user-facing progress on these titles.
Many of these slated Unigine-powered titles are years old and have yet to be released. Arguably the most interesting game title is Dilogus: The Winds of War, with a slated Linux port, but there's been no news on this game in many months. The only small Unigine-powered game update I have been able to find is that at least Cradle is progressing, at least as of early March.
Aside from games, Unigine at least seems to be used well within architectural visualization and other customized areas.
Regardless, the Unigine Engine proves to be an interesting game engine with an OpenGL 3.2+ renderer and first-rate Linux support. Hopefully more games will come to this visually impressive game engine as Linux gaming finally takes off.