Red Eclipse is an open-source first-person shooter that is forked from Cube 2: Sauerbraten. Like the original Cube 2, it features multiplayer gameplay as well as in-game level editing, but with improved graphics and a focus on parkour movement. The game is free and open-source software, released under the zlib license, and developed by an open community of contributors. Its content is free, and released under a CC BY-SA license.