Wikipedia
BennuGD
BennuGD (also referred as Bennu Game Development or Bennu) is a high-level open source video game development suite, originally created as a Fenix Project fork by Argentinian hacker SpliterGU. It is officially supported for Windows, Linux, GP2X Wiz, GP2X Caanoo and Dingux, but can also be run on multiple other platforms to some extent, including FreeBSD, Mac OS X, iOS, and consoles such as GP2X, Dingoo A320, and Wii. Most recently BennuGD has been ported to Sega Dreamcast and PlayStation 2.
BennuGD focuses on modularity and portability and makes it easy for both beginners and experienced users to create their own games.