De Bellis Indica is a DBA variant for simulation of warfare in India in the 18th and 19th centuries. The basic scale is 1 figure = 50 men and 40mm = 100 paces
Valley of Fire is a free campaign system for the Northwest Frontier. The authors write:
This is a fictional colonial campaign set in the Northwest Frontier during the late 1880s. A British fort is under siege and a relieving force has exactly one month to break the siege! The villages in the valley and mountain passes go into revolt, adding more and more foces to the siege and to block the British advance. The system features hidden movement, is of moderate complexity, and is designed to be run with or without a referee. The PDF contains rules, counters, a planning map, and log sheets.
Bob Berman offers a set of free fast play wargames rules for the Indian Mutiny, based on “a number of sources, including “From MacDuff to the Frontier” and “The Sword and the Flame.” They are designed for fast play, with all players on one side.”
Here are a set of houserules called Fields of Honor. I can’t tell whether they’re houserules FOR the Fields of Honor set, or a set of houserules BASED on Fields of Honor. I lean toward the latter. They look like a fairly complete set that bears more than a passing resemblance to the original Fields of Honor set published a decade or so ago by Pinnacle.