Not sure how recent this news is, but the website of the SpringRTS based FOSS RTS Zero-K states that their online campaign metagame PlanetWars is now in BETA.
This is a screenshot of the webbased planet overview, which shows how well you (and your clan-mates) are progressing in taking over the galaxy.
Game-play of Zero-K does not change much with this game-mode, but it puts each game into a greater perspective so to say ;) But check out their own description of what PlanetWars is here.