Platemail is a free RPG based on the seminal Chainmail wargames rules. The Book of Magic is here.
Role Playing Games
Dungeon Tiles To Print and Play
Quests of Legend has a nice collection of dungeon tiles for you to print out and use for your role playing or miniatures games (or both!) in a dungeon crawl.
Free Elements LITE RPG
Free Elements LITE is a starter version of a more complex RPG where, according to the author:
This system utilizes the Elements TTRPG system, which is a freeform action system. You perform actions by describing what you want to do, and picking a skill to use. Based on that skill’s rank, check your multiplier table to see how many points it has. All checks require skill rolls from both parties to determine the success rate, regardless of what the target may be, you’ll engage in a battle of skill checks with it. If you don’t have the proper skill, you must perform an untrained skill check with it. Rate of success when performing an action determines the outcome of a battle, if successful enough the DM will allow you to describe the outcome, where if you’re within 9pts of each other’s checks the DM will describe what happens instead.
Machinations Steampunk RPG
Machinations is a simple steampunk RPG. From the author’s description:
Welcome to the Eternal City, the home of the Machinations RPG. Take on the role of an Adventurer, an Alchemist, an Artificer or even a deathless Automaton. Band together with others to form a Free Company and then hire yourselves out to perform acts of sabotage, espionage, assassination, extortion, blackmail or plain old robbery. All in a world a short step from our own, where reason has been lost, empires exist to be built and strange technology dominates all walks of life. It is a world of sinister intrigue, awful power, terrible events and dark portents. There is also beer, song and glory
Old School Hack RPG
There are a lot of people out there trying to recapture the spirit of the original D&D games. For my own part, I can think of nothing that was more magical than my first excursion into the blue covered rulebook I got back in the late 1970s/early 1980s. Old School Hack is another attempt.