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Message: <blockquote data-quote="Ranger REG" data-source="post: 1686112" data-attributes="member: 533">d20 RPGs are those with the little square d20 system logo. Usually, it means the mechanics of the game is almost a split resemblance to D&D rules, from the six ability scores, classes, even the combat sequence. There may be minor changes or deviation to the D&D rules, but it's not enough to call it a completely different ruleset.Non-d20 RPG are those that don't have the little square d20 system logo. Obvious examples are GURPS.There is another type call OGL RPG. These games are based on WotC's System Reference Documents and applied under the Open Gaming License alone. You have more freedom publishing under just this license, but the drawback is you don't get to claim your product as being compatible to D&D. At least not directly. Do note that there is an influx of new open rules systems being applied under the OGL, such as the Action! System core rules, and Prometheus.Well, the list keeps growing. Your best source is EN World.It varies. The best way to do it is test it yourself. Start with small material like feats and skills. Then try classes. Then there are mechanics that replaces D&D mechanics, such as the health system (replace the hit points system with VP/WP or Injury). Test them out and see if they makes your game more enjoyable.</blockquote>