The Black Dog of Doom offers a set of free wargames rules for fighting the Anglo-Zulu wars.
From the Wargames Holiday Center comes Harry Point Blankers, a set of free wargames rules for the Indian Mutiny.
Donald Bailey’s Pith Helmet 2 are “are an innovative set of rules that are condensed onto a single Quick Reference Card to play with. Mr Bailey has kindly made his system available for download on this site. The link has an archive or resources and the QRF and rules and much more.” From www.britishempire.co.uk
The Portable Wargame project has a set of Colonial Rules. These rules are designed to be played on a square, checkerboard like grid.
Bill Molyneaux offers a set of free wargames rules for fighting the Zulu war.