Frictional Games' HPL1 engine used to create the Penumbra series.
A bit weird engine, the Penumbra series is using it as well as Amnesia. They are all awesome first-person horror/puzzle games that I love, I guess the engine is good, not perfect. But it's Indie so... Oh and it's apparently open-source, cool!
Как ни крути, все таки этот движок может быть когда-нибудь идеалом))) (наверное уже HPL2)