D20 system

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Because THAC0 confused stupid people sucked, Wizards of the Coast distilled the essence of the D&D mechanics to a more streamlined mechanic.

Most of the d20 System was released as the System Reference Document (SRD) under the Open Game License (OGL) as Open Game Content (OGC), which allows people to make and release supplements for free. This led to multiple game breaking splatbooks for D&D, and a glut of samey RPGs, mostly because people figured it was worthless to challenge Wizards, and so d20 was soon seen on everygoddamnthing.

Mechanically, d20 is basically a watered down reversed version of the AD&D 2E rules, with huge chunks stolen from Megaversal and SPECIAL, like feats. It works just about as well.