Tempus Diducit

From publisher blurb: They call it the Unraveling. Or they will, anyway. Hard to say with time travel. Too many trips, and timelines begin to fray at the edges. Most folks just struggle to adapt to this broken world. Some exploit it for their own gain. But for others — the warriors, investigators, and agents of change — there are wrongs to right, paradoxers to catch, and a glimmer of hope of fixing this mess. Tempus Diducit is a super-slim, self-contained, lo-fi sci-fi RPG about a world where every era is happening right now. It's inspired by every bonkers, kitchen-sink roleplaying game you've ever shaken your head at. It's built with the same rules as the free 24XX SRD, and encourages you to bring in characters made from any other 24XX game. It's 3 pages and a cover, fitting on two sides of a letter-sized page.