My favouruite 3D engine is the one used in Zanzarah, which is based on Renderware, but unfortunately I don't know much more about it.

Far Cry seems to have a very good engine as well.

2D ... well, I couldn't say; maybe Sacred and <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" /> / <img src="/ubbthreads/images/graemlins/div.gif" alt="" /> ? But, well, in Sacred and :BD it's actually a mixture between 2D and 3D ...

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch