Farland Mass Combat System Program

The Farland Mass Combat System is designed to help role players resolve large scale conflicts. There’s also a great — and free — program to help you do so.

d20 Barsoom Variant

Edgar Rice Burroughs’ Barsoom novels are among my favorite guilty pleasures. Sean K. Reynolds has a page with material, including monster and character profiles from his d20 Barsoon campaign.