Terra Tenebrae is a free (as freedom) multi-players RPG game engine. It's based on Clients/Server technology : A client based on modified sources of Landes Eternelles and Eternal Lands client game (written in C, under QTPL license). A server based on modified sources of Freelands server (written in Java, under GPL license). Open source medias (under CC-By, CC-By-SA, GPL or public domain licenses). This project is in early development.