Free multigenere RPG system. Currently has fantasy and SuperHeroe rules.

Rules that fit multiple settings and can be used as freeform guidelines or strict mechanics.

Contains to free games: Alternacy, featuring character-driven skill development; and Mnemonic, a minimal rules, memorizable system designed for portability.

A free universal RPG by Carter Butts, Karim Nassar, and Brian Rayburn. Approx. 88 pages (HTML, MS Word, Postscript).

Minimalist system using logarithmic scales for all game mechanics.

Presenting LIQUID a free universal RPG and many tipps and tricks for GMs.

By Craig Griswold. Contains scenarios, rules, and paper minis.

A free RPG that incorporates concepts of Jungian psychology and Robert Anton Wilson's writings to produce a multi-genre cross-worlds playing environment.

A universal RPG by Chieh Cheng. Approx. 33 pages HTML rules, plus four approx. 10-15 page genre books (fantasy, modern, near-future).

A simple role-playing engine, which can be customised for various game worlds and game types.

A small set of rules suitable for running compaigns of independent backgrounds. Open content license, downloadable in PDF format.

Free simple role-playing system; there are no statistics, little math, no complex charts of equipment, and no magic. Characters represent skilled, but human (or roughly human), beings and have to use their wits rather than their powers, attributes or magic items to succeed.

This diceless universal determination engine is a one-stat, cinematic, freeform RPG, with several sourcebooks.

A simple, universal system, with a stable core rule, a complete foundation, and plenty of room for modifications. Free to all.

Freeform organic diceless system that puts system mechanics in the hands of the users.

Ex Mortis base role playing system. Free to the public. Fully functional RPG.

Works with any time period and genre, includes 16 species, magic and monster systems, and realistic rules all of which are optional.

The "Fast and Easy RPG", a small coin- and dice-based system. Includes two campaign settings.

Skill- and attribute-based rules designed to fit on one page.

A Free dice and stat based RPG

A free, one page, generic game system.

Web Site of the Gestalt Roleplaying System. Featuring system rules and scenarios for free download. "Coming soon".

Free 32 page PDF version of the GURPS rules. "Covers the essentials of character creation, combat, success rolls, magic, adventuring, and game mastering."

The Hugely Adaptable (Action/Anime) Role-Playing Engine is a free, easy to use universal role-playing game geared towards high-action/anime role-players, but can be used with any RPG style and genre.

An in-depth diceless system.

Light-weight role playing game rule system which emphasizes simplicity as well as the scenario and fluently progressing plots.

Generic role-playing game. Official site.

Modular RPG construction set. Free express rules for download include open collaborative license.

Freely available rules for a multi-genre role-playing game and supplements.

An extensive universal system with supplements for psionics, chi martial arts, cybernetics, superpowers, and magic.

An open ended system that adapts to a range of settings and genres with few rules.

A set of simple rules for playing RPG games with kids using the OGL system.

Series of interlocking games that focus a little more on love (both in the ideal and carnal sense) than those that have proceeded it.

One page gaming system for super heroes.

Simple one page gaming system.

Rules light, point allocation, skill based game from Ragnarok Press.

A multi-genre system. Basic and Advanced rule books are available free for download.

A 2 ten sided dice using system released under the Free Gaming License.

A modular system that is adaptable to many styles of play.

A versatile multi-genre free RPG by Frank J. Perricone. It is a modular system originally intended for use with Rolemaster's combat system. Over 100 pages, illustrated.

Public domain rules intended for family-friendly roleplaying.

A free card-based system.

Diceless system. Includes sample dark future and fantasy campaigns.

Foundations for a game system, reference implementation of that system and resource page to develop game worlds.

A small system using attribute based dice pools.

Simple yet powerful roleplaying for all ages.

(Simple, Laid-back Universal Game) Copyright 1992 & 1993 By Steffan O'Sullivan

A "storytelling-oriented" game with rules available in English and Italian.

TARE, a universal rules engine. The complete basic rules are currently free, with two commercial campaign settings available for it.

A universal covering fantasy through cyberpunk/science fiction. Requires only D6 and most actions are resolved through a single outcome resolution chart.

Includes fantasy and science fiction campaign settings.

A generic rules-lite roleplaying game that utilises neat little character descriptions and a five-rung ladder of task results as the core mechanic.

A point-based, skill-based roleplaying game distributed under an Open Content license.

A player-empowering generic roleplaying system.

Flexible, modular rules built around three gaming precepts.

A model reality kit, where what seems real is real.

A Free-RPG with the goal of being the most played free-RPG in the world. UniSys is a realistic, advanced, fast and detailed universal roleplaying game. .

Includes add-on rules, essays by the authors and links to the official discussion forum.

Includes a generic roleplaying game called Toaster, with rules and descriptions.