S2 ENGINE HD is a complete general-purpose software kit for developing and running videogames or other virtual-reality applications such as architectural walkthrough, physical simulations, etc... From single users to architects, from indie teams to semi-professional or professional game teams, all can take advantage from S2Engine HD technology power for producing games, serious games, architectural walk-throughs, realtime animated sequences, simulations and so on...
The interface it's not the strong point but it's ok, particles are bad optimized and consumes so much resources.
Good light rendering, also the shadows are pretty good, blender import it's relatively easy.