Chronocrash is the home community for the OpenBOR engine and downloading OpenBOR games. They also have forums relating to MUGEN. OpenBOR is an engine for creating 2d side-scrolling games, with most games created for it being in the Beat'em-up genre. Many of the games created by the community have made their way into various game collections due to their quality. The engine is open and free to use, and is a solid option for anyone interested in making their own 2d game that falls in the beat'em-up, fight game, or general side-scroller area of genres.

Adventure Game Studio is a free game engine that can be used to create your own point-n-click style adventure games, ala Myst, King's Quest, Maniac Mansion, Sam & Max, etc. While the AGS program itself is only for Windows, it is capable of creating games that can also run on other platforms. It has been used to create retail games, such as Gemini Rue, Resonance and the Blackwell games. It was also used to re-master some classic adventure games such as King's Quest 1 & 2. It has its own community that creates a number of interesting indie games that are released for free. A solid engine option for someone looking to create their own adventure games. Also just interesting for the games community members make.