The Grid Based Wargaming Blog has a set of free wargames rules for company level units using 28mm models and a 6 inch grid.
Jack Scruby’s African Colonial Wargames Rules
Here’s a set of African Colonial wargames rules from the Godfather of American Wargaming, Jack Scruby.
Heroscape Soulsteader Game Variant
Soulsteader is a Heroquest variant that
that can be played with any number of people. This game allows the process of building the landscape to be an intrinsic part of gameplay, and not merely a task performed prior to battle. It is intended as a better way to play HeroScape, one which makes every aspect of the product part of the gameplay itself.
The game centers around tile constructions called Wellsprings, control o
WRG 1925 – 1950 Armor and Infantry Rules
The Wayback machine has stored a copy of the WRG 1925 to 1950 armor and infantry rules from 1973.
Viking Painting Guide
Kurtis Brown offers a one-page painting guide to Vikings.
Note: the link above is dead, and an email to Kurtis bounced. So I went to the Wayback Machine and retrieved a copy of the page. It is preserved below for posterity.