From publisher blurb:
Do you feel constrained by the class system and complexity of many major RPG systems? Or perhaps you want the freedom to write, publish or commercialize your homebrew material? If so, we've got you covered!
Our free STRONG RPG is a classless, open source roleplaying game that is just as deep and fulfilling as many major commercial RPG systems you might have already played. However, we've done a few things differently. The STRONG RPG is Symmetric (balanced character options, even when considering spellcasters), Terse (uses the same dice mechanic for every roll), Reliable (behaves the same at all levels of play), Open License (releasable as an open source SRD), has No Classes (mix and match all options), and is Generic (suitable for a wide variety of fantasy settings).
However, STRONG RPG is not a rules-lite system. In this 127-page book, you'll discover rules that are both simple and comprehensive. We've also included support for 21 common character archetypes, but in this system, you're never constrained to any particular class. Build a fighter that teleports across a battlefield, or a cleric who insults heretics, or gunslinger who augments their bullets with magic.