Quick Intermediate Level Skirmish is a set of free wargames rules for battles with small force sizes. It is multi-genre and designed to be simple.
The Miniature Wargaming Editor
WarZone Resurrection Rules
WarZone, in its original incarnation some twenty years ago, was one of my favorite games. I still have substantial painted armies from that era. Then the game went through a series of owners, rules changes, and model changes. Eventually, it died, only to be resurrected by Prodos. That company has the latest version of the WarZone rules free for the downloading.
Warhammer Colonials From Jervis Johnson
Warhammer Colonials is a set of amendments to Warhammer 40K for 19th Century colonial warfare. from Jervis Johnson himself.
18Africa Board Game
18Africa is a free print-and-play board game from the 18xx rail game genre.
Darrell’s 15mm Napoleonics
In Darrell’s 15mm Napoleonics Rules, each unit represents an Infantry Battalion, Cavalry Regiment or Artillery Battery consisting of 2 – 4 Stands.