Danger Patrol is a pulp-style RPG with a very interesting dice mechanic that I think would be great for skirmish style wargames. With the mechanism, players voluntarily make things more difficult for themselves in order to gain reward points when they succeed against overwhelming odds.
Role Playing Game
Swords and Wizardry RPG
Swords and Wizardry is yet another free, old school fantasy RPG
Spellcraft and Swordplay Role Playing Game
Free for the downloading, Spellcraft and Swordplay is a professionally done “old school” fantasy RPG.
Dark Dungeons Retro Clone Role Playing Game
Dark Dungeons is a clone of the old school D&D game. There’s been a real renaissance in the retro style RPGs, and its one I welcome after all those years of angst ridden vampires and new-style gaming.
Microlite 74 Free RPG System
Party like it’s 1974!
The Microlite 74 RPG system is a slimmed down, old school fantasy RPG:
Microlite74, like its parent game, Microlite20, is a trimmed-down, sub-miniature version of the Primary Fantasy SRD rules that has been designed to be quick and easy to play. The goal of Microlite74, however, is to recreate the style and feel of that very first (“0e”) fantasy roleplaying game published back in 1974. If you are at all familiar with any game based on the 3.5 edition of the Primary Fantasy SRD, you will find Microlite74 easy to play and easy to run as a GM, but with an extra helping of “old school” flavor.
While Microlite74 is designed as an introduction to “old school” play for players more familiar with modern rules systems based on the Primary Fantasy SRD, it is a rules-lite OGL based game system that old school grognards – especially those who cut their gamer teeth on “0e” – should find equally enjoyable. It is also easy to modify with your own house rules or rules drawn from your favorite edition of the world’s most popular fantasy roleplaying game.