The Mana project aims to create a 2D MMORPG platform (a client, server, and Web component). The software was originally developed as part of The Mana World.
The Gamebook Engine is a cross-platform engine for
writing gamebooks, such as the "Choose Your Own
Adventure" series or the "Lone Wolf" series. TGE
can interpret scripts that use the "Hyena"
gamebook format.
ianout is a next generation 2D engine that is
intended to have strong modding support. It
supports the Fallout 2 graphic assets and is
excellent for creating post apocalyptic games.