ARM
Minimalist system using logarithmic scales for all game mechanics.
3Muse D6 RPG System
Free multigenere RPG system. Currently has fantasy and SuperHeroe rules.
Cyno's Roleplay
A universal RPG by Chieh Cheng. Approx. 33 pages HTML rules, plus four approx. 10-15 page genre books (fantasy, modern, near-future).
Simple Rules Engine
A two page generic skill and attribute based roleplaying engine, focused on characters and stories.
Storytelling20
A "storytelling-oriented" game with rules available in English and Italian.
The Osprey Open Source Roleplaying Engine
A point-based, skill-based roleplaying game distributed under an Open Content license.
Infinite Horizons
Freely available rules for a multi-genre role-playing game and supplements.
Fantastic Realities
Works with any time period and genre, includes 16 species, magic and monster systems, and realistic rules all of which are optional.
DUDE Role-Playing Game
This diceless universal determination engine is a one-stat, cinematic, freeform RPG, with several sourcebooks.
Nuelow
Series of interlocking games that focus a little more on love (both in the ideal and carnal sense) than those that have proceeded it.
Hyper
Generic role-playing game. Official site.
EGO-Endless Gaming Options
A simple, universal system, with a stable core rule, a complete foundation, and plenty of room for modifications. Free to all.
Generic Roleplaying All Purpose Engine
A free, one page, generic game system.
Harpe
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.
Gestalt - Innovative Roleplaying
Web Site of the Gestalt Roleplaying System. Featuring system rules and scenarios for free download. "Coming soon".
Alpha-Zulu Games
Contains to free games: Alternacy, featuring character-driven skill development; and Mnemonic, a minimal rules, memorizable system designed for portability.
Ex Mortis V 1.0 BRPS
Ex Mortis base role playing system. Free to the public. Fully functional RPG.
Universal
Features a free, universal roleplaying game system. Also includes supplements for the fantasy and Doctor Who genres.
POLY, a free, customizable system for table top and LARP
A modular system that is adaptable to many styles of play.
Player's Labor-saving Utility System
Alan Glvoer's archive of Joe Coleman's PLUS RPG.
Quasar Role-Playing Game
Public domain rules intended for family-friendly roleplaying.
RIP
Diceless system. Includes sample dark future and fantasy campaigns.
Draft RPG
A small set of rules suitable for running compaigns of independent backgrounds. Open content license, downloadable in PDF format.
Epitome - Continuous Roleplaying Game
Freeform organic diceless system that puts system mechanics in the hands of the users.
Hexatome: Exploiting the Number of Six
Light-weight role playing game rule system which emphasizes simplicity as well as the scenario and fluently progressing plots.
Paradox
A multi-genre system. Basic and Advanced rule books are available free for download.
Cosmic Synchronicity RPG
A free RPG that incorporates concepts of Jungian psychology and Robert Anton Wilson's writings to produce a multi-genre cross-worlds playing environment.
Kaleidoscope RPG Support Page
An open ended system that adapts to a range of settings and genres with few rules.
DCS
A simple role-playing engine, which can be customised for various game worlds and game types.
Percentile Dice Game System
A 2 ten sided dice using system released under the Free Gaming License.
The Awakenings Rules Engine
TARE, a universal rules engine. The complete basic rules are currently free, with two commercial campaign settings available for it.
The Ladder
A generic rules-lite roleplaying game that utilises neat little character descriptions and a five-rung ladder of task results as the core mechanic.
Shadows
Simple yet powerful roleplaying for all ages.
GAME
Skill- and attribute-based rules designed to fit on one page.
OPIGS:
Simple one page gaming system.
OPIGS Supers
One page gaming system for super heroes.
SAGA
A small system using attribute based dice pools.
SLUG
(Simple, Laid-back Universal Game) Copyright 1992 & 1993 By Steffan O'Sullivan
ToAd
A model reality kit, where what seems real is real.
Alternate Realities
A free universal RPG by Carter Butts, Karim Nassar, and Brian Rayburn. Approx. 88 pages (HTML, MS Word, Postscript).
Heritage
An in-depth diceless system.
Dramats Personae
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.
The Guide to Adventure
Includes fantasy and science fiction campaign settings.
The Window
Flexible, modular rules built around three gaming precepts.
Campaign HQ
By Craig Griswold. Contains scenarios, rules, and paper minis.
Impresa Modular Roleplaying System
Modular RPG construction set. Free express rules for download include open collaborative license.
Oroborus multi-genre RPG
Rules light, point allocation, skill based game from Ragnarok Press.
Prism
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.
GURPS Lite
Free 32 page PDF version of the GURPS rules. "Covers the essentials of character creation, combat, success rolls, magic, adventuring, and game mastering."
The Freestyle RPG
A universal covering fantasy through cyberpunk/science fiction. Requires only D6 and most actions are resolved through a single outcome resolution chart.
FERpg
The "Fast and Easy RPG", a small coin- and dice-based system. Includes two campaign settings.
UniSys-Universal System
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. .
Xenongames - Other Roleplaying
Includes a generic roleplaying game called Toaster, with rules and descriptions.
Role Playing System
Foundations for a game system, reference implementation of that system and resource page to develop game worlds.
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