The Simple Game System (2008)

from the rules:
a role-playing game of supreme simplicity, ease of play, and fast action.

To resolve any action in the game where there is a significant chance of failure, or any action opposed by another character, dice are rolled. This game uses only standard six-sided dice.

user summary:
A simple set of role-playing rules. Characters are defined by a limited number of choices made from a set of ability-disability pairs. An ability may be chosen twice to enhance it. The choice of dis/abilities affects the characters dice pool. A simple skill system is also defined.

The Simple Game System core rules are available as a free download from Chris Gonnerman's Simple Game System page. See the RPG level entry for a link to the site.