The World Of Gainar is a massive work — a complete RPG system set in a post-apocalypse fantasy world. This is no Gamma World, however. From my reading, it seems to be more of a traditional fantasy — with dwarves and elves (fey), swords and shields, but also with gunpowder and steam tech. For those who just want the background, there’s a stripped down version that’s just the world book.
RPG Fantasy
Warrior and Wizard RPG and Combat Game
Warrior and Wizard is an RPG and Combat game apparently inspired by The Fantasy Trip.
Character Sheets For The Fantasy Trip
Seven Hex Dragon has some free pdf character sheets for The Fantasy Trip.
The Basic Fantasy Role Playing Game
The Basic Fantasy Role Playing game is just that — a role playing game released under the Open Game License. it’s based on the d20 3.5 rules, but takes its inspiration from old school role playing.
Ironsworn Free RPG
Ironsworn is a fantasy RPG that can be played with a traditional GM, as a co-op, or solo game. In this setting, players are heros pursing quests. There is a free downloadable version, as well as commercial soft and hard cover editions.