Kings of War is a miniature wargame by Mantic. Rules are free on their site.
Just a few things I've been working on to expand the game
Orcs & Goblins Army List
(Version 2) (Requires some special rules from the mercenaries file)
I've helped with the Dark Elf list by Andrew Lee from the Mantic Boards, mainly in formatting it and I'm hosting it in PDF here as well.