FLAIL is an old-school, fantasy RPG where spells act up, weapons fall apart, and characters survive mostly through nerve and sheer luck. Designed for people who like single-session dungeons and short campaigns of 10~15 sessions. Low-prep, max play.
Tremendous and inspirational resources for gamemasters! Dungeon Denizens 2 is a huge hardcover with 350+ monsters, How to Write Even Better Adventures has advice from experienced game designers, and there's even more!