Graphic engine is Ogre. Everything was done in Max and oFusion plug-in was used for exporting. Also ShaderFX plug-in was used for some shader work.
Here are screenshots (from pre-alpha stage, concept arts by Tamer Karataş):
Factory ArenaThis is the first arena I made.
Harbour ArenaThis was made by another artist but after he left we decided to change it.
About 80% of it was changed.
Céidot ArenaThis was changed like Harbour Arena.
About 40% of it was changed.