Super Heroes Free Systems
You have found the way to Free Systems on Super Heroes:
See also:
Men & Supermen - A game distributed under the GNU Free Documentation License.
Panels - Tabletop game which paints the world of superheroes in broad strokes. Numerically light, almost free form rules.
Risus Supers Version 1.1 - Provides simple game mechanics to simulate superheroes who no one takes seriously. Includes character cliches and rules for common contests.
Rumble - A simple and fast paced system with a large list of super powers.
Super Heroes and Heroines - Designed to portray superheroes who have personal lives. Help build the largest human-edited directory on the web.