This is a really useful resource for Swords and WIzardry. One thing that I really like are the Optional Traits to make the core race-as-class Classes interesting and add flavour. It's no fun having two Elves in a game and they just seem like carbon copies of each other. This makes it more interesting for sure. There is also a great Further Reading section letting you know where to fine playable Half-Giants, Vampires, etc.
Full disclosure: my Darkfast Classic Fantasy Class Compendium is listed as well.