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.
- http://red-irish.itgo.com/Games.html

ToAd
- A model reality kit, where what seems real is real.
- http://www.talesofadventure.net/1whatsnew/

Player's Labor-saving Utility System
- Alan Glvoer's archive of Joe Coleman's PLUS RPG.
- http://www.chorazin.org/jorune/plus/

Fantastic Realities
- Works with any time period and genre, includes 16 species, magic and monster systems, and realistic rules all of which are optional.
- http://jeremy.gagliardi.com/Real-Playing/

OPIGS:
- Simple one page gaming system.
- http://www.homebrew.net/games/opigs.html

OPIGS Supers
- One page gaming system for super heroes.
- http://www.homebrew.net/games/opigs.supers.html

Kaleidoscope RPG Support Page
- An open ended system that adapts to a range of settings and genres with few rules.
- http://www.fantasylibrary.com/lounge/kaleidoscope/kaleid.htm

Impresa Modular Roleplaying System
- Modular RPG construction set. Free express rules for download include open collaborative license.
- http://www.pigames.net/impresa.php

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.
- http://www.ekkaia.org/rpg/hexatome/

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 magi
- http://www.malaan.com/dramatis/dramatis.htm

Draft RPG
- A small set of rules suitable for running compaigns of independent backgrounds. Open content license, downloadable in PDF format.
- http://www.ekkaia.org/rpg/draft/

Campaign HQ
- By Craig Griswold. Contains scenarios, rules, and paper minis.
- http://www.pcisys.net/~pandemonium/effective/

Alpha-Zulu Games
- Contains to free games: Alternacy, featuring character-driven skill development; and Mnemonic, a minimal rules, memorizable system designed for portability.
- http://www.alphazulugames.com/

Paradox
- A multi-genre system. Basic and Advanced rule books are available free for download.
- http://www.faight.net/html/paradox.html

Infinite Horizons
- Freely available rules for a multi-genre role-playing game and supplements.
- http://ih.trawna.com/

DUDE Role-Playing Game
- This diceless universal determination engine is a one-stat, cinematic, freeform RPG, with several sourcebooks.
- http://kuoi.asui.uidaho.edu/~kamikaze/DUDE/

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.
- http://kuoi.asui.uidaho.edu/~kamikaze/Nuelow/

Alternate Realities
- A free universal RPG by Carter Butts, Karim Nassar, and Brian Rayburn. Approx. 88 pages (HTML, MS Word, Postscript).
- http://www.karimnassar.com/AR/

Generic Roleplaying All Purpose Engine
- A free, one page, generic game system.
- http://unseelie.org/grape/

SAGA
- A small system using attribute based dice pools.
- http://www.homebrew.net/games/saga-1.1.html

Epitome - Continuous Roleplaying Game
- Freeform organic diceless system that puts system mechanics in the hands of the users.
- http://www.ekkaia.org/rpg/epitome

Shadows
- Simple yet powerful roleplaying for all ages.
- http://www.harlekin-maus.com/games/shadows/shadows.html

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).
- http://cynosurex.granax.com/Cyno's%20Role-Play/

GAME
- Skill- and attribute-based rules designed to fit on one page.
- http://www.homebrew.net/games/game.html

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.
- http://www.rpglibrary.org/systems/prism/

Quasar Role-Playing Game
- Public domain rules intended for family-friendly roleplaying.
- http://www.conroyhome.net/alan/quasar/index.htm

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.
- http://www.fantasylibrary.com/lounge/cosmic/cosmic.htm

The Guide to Adventure
- Includes fantasy and science fiction campaign settings.
- http://www.meramic.com/tgta/

RIP
- Diceless system. Includes sample dark future and fantasy campaigns.
- http://www.cs.helsinki.fi/u/marjola/RIP/

The Window
- Flexible, modular rules built around three gaming precepts.
- http://www.mimgames.com/window/

SLUG
- (Simple, Laid-back Universal Game) Copyright 1992 & 1993 By Steffan O'Sullivan
- http://www.homebrew.net/games/slug.html

Gestalt - Innovative Roleplaying
- Web Site of the Gestalt Roleplaying System. Featuring system rules and scenarios for free download. "Coming soon".
- http://website.lineone.net/~james.graham/Home.html

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."
- http://www.sjgames.com/gurps/lite/

Oroborus multi-genre RPG
- Rules light, point allocation, skill based game from Ragnarok Press.
- http://www.ragnarokpress.com/oroborus/

ARM
- Minimalist system using logarithmic scales for all game mechanics.
- ftp://ftp.trawna.com/pub/rpg/games/arm