Blood Bowl Series

Blood Bowl is Games Workshop's game of fantasy American football.

First Edition

Blood Bowl - First Edition
Blood Bowl - First Edition: Death Zone

Second Edition

Blood Bowl - Second Edition
Blood Bowl - Second Edition: Elves, Dwarfs and Dungeonbowl takes the game underground and includes figures for two teams: one Dwarf and one Elf.
Blood Bowl Star Players expands the game with the creation of new star players, a simple campaign system and new races.
Blood Bowl Companion introduces a lot of new rules as well as the official NAF game variant.

Third Edition

Blood Bowl - Third Edition
Blood Bowl: DeathZone
Blood Bowl: Living RuleBook

Note: I am fairly certain that this list of Blood Bowl games is not complete. I am only familiar with the second edition. Perhaps someone else can flesh out this list and explain the differences between editions. Thanks - catnthehat.