Hundred Kingdoms is a set of free wargames rules for fantasy battles with a wide variety of factions.
fantasy
Burrows and Badgers Rules
Burrows and Badgers is a set of free wargames rules for tabletop adventures with bands of anthropomorphic animals. There’s also a supporting set of miniatures.
Fields of Battle Fantasy Rules
If you have an account with Scribd, you may be interested in a set of fantasy rules that appeared in Warlock Magazine in 1986: Fields of Battle by Graeme Davis
Dragon Slayers RPG
Dragon Slayers is a playest version of an upcoming free role playing game. The author writes:
Dragon Slayers RPG looks like Savage Worlds but plays like D&D 5e. The goal is to have D&D-style adventuring without the fiddly bits. GMing is easy and the game is great for new players and one-shots. It features step-die mechanics and has inherited a few dirty hippie quirks (abstract equipment, 13th Age style backgrounds). Magic is low-ish powered and mages cast with spell points.
Ares Magazine Citadel of Blood Boardgame
The Internet Archives has collection of old Ares Science Fiction and Fantasy gaming magazines. Issue #5 has a complete game called Citadel of Blood.