GURPS - Compendium II

From their website:

"GURPS Compendium II is full of material from scores of GURPS worldbooks published in the last eight years – many of them out of print – about how to run a better GURPS game, how to handle roleplaying problems that come up (some universal, some particular to GURPS), expanded rules for character combat, injury and illness, mass combat, spaceship combat, and much, much, more!"