Maybe Unity could be used as a level editor for Gamestudio? laugh I am not sure though if the free edition allows to write exporters.

Quote:
Unity Technologies the leading provider of the multi-platform game development platform for Web, PC, Mac, Wii and iPhone today announced that it has secured Series A financing of $5.5 million.

http://unity3d.com/company/news/sequoia-capital-press.html

shocked