Wargames Rules 1685-1845 is a set of classic WRG rules from 1977. I own a copy, but you can get your own in pdf form at the link.
Niagara 1814 Scenario Book
Niagara 1814 is a scenario book for Blackpowder. As with any book of scenarios, however, they can be adapted to whatever rules set you play
City Grounds Fantasy Skirmish
City Grounds is a fantasy skirmish game in the vein of Mordheim, but with different mechanics.
Adventure Planning Brainstorming Tool
Gnome Stew has an interesting form to help you plan gaming adventures. It gives the game master a place to record locales, story goals, adversaries and treasures. It is intended for role playing, but I think it also would be useful for those story-driven miniatures skirmish games.
Shaun of the Dead Card Game
Shaun of the Dead is free card game based on the very funny movie of the same name.