ACWCO Engineering Center - This site provides information on the HPS ACW games .oob, .pdt, and .map files. What information the files contain and how to modify them as well as a basic tutorial on using the HPS ACW Scenario Editor

ACW Campaign Games Design Center - This site provides many custom battles, scenarios, and add-ons Primarily for use with HPS Campaign Corinth and Campaign Ozark; these battles are linked within the ACWCO.

Ken Miller's HPS Campaign Corinth Files - This site contains required and optional files to enable the use of custom HPS Campaign Corinth games.

Scenario Design Center   - This site is designed to provide you with utilities and ideas to create custom scenarios for use with all the John Tiller Games from both HPS Simulations and Talonsoft including the Civil War and Napoleons campaigns.

Napoleon in Russia Project - This site contains a large number of custom battles for the Talonsoft BG series including Napoleon campaigns, American Civil War, and others.  They also provide services for developing BG maps.
 

The Real Unofficial War Game Page - This site contains patches and upgrades for the Talonsoft BG series games.