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.
Rules: Fantasy
Dungeon Delvers Rules
Dungeon Delvers is a set of free dungeon crawl rules.
Song of Blades and Heroes Solo Rules
Here are some interesting thoughts on playing Song of Blade and Heroes solo.
Isildur’s Bane Solitare LotR Battle Game Rules
Isildur’s Bane is a set of free wargames rules for playing solo games of the Lord of the Rings Battle Game.
Solo Lord of the Rings Battle Game Rules
Isuldur’s Bane is the name of a free set of rules for playing Games Workshop’s Lord of the Rings Battle Game.