exult (dominus)
Exult is an open source, GPL-2.0, cross platform reimplementation of the Ultima VII engine. Ultima VII is a DOS game created by Origin in 1992. On top of that we feature a GTK+3 based tool to create your own mods and games with this engine. Development of Exult has started in 1998 and has been on SourceForge since 2000. Our website is at http://exult.info.
opensurge (alemart)
A fun 2D retro platformer inspired by Sonic games and a game creation system that lets you unleash your creativity!
Open Surge is a free and open-source game available at: http://opensurge2d.org
Licenses: GPLv3 (game engine), MIT (scripts), CC-BY/CC-BY-SA/CC-0 (artwork)