This week Bundle of Holding launched the EABA bundle:
http://bundleofholding.com/presents/EABAAdventurer! This EABA Bundle presents the universal tabletop roleplaying rules system EABA ("End-All, Be-All"). Designed by Greg Porter (Corps, TimeLords), EABA represents the "Simulationist" school of RPG design, which aims for accurate, fine-grained modeling of a campaign universe that operates sensibly. With EABA's scaling rules you can build anything from a zipgun to a battleship, and run any kind of conflict from a schoolyard fight to a superhero slugfest. The state-of-the-art interactive .PDF ebooks in this bargain-priced collection range from steampunk to space opera, all using the same coherent, deeply thought-out system.