Reasonable Brom is a variant of Larry Brom's standard rules for the 19th Century.
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The Revised Brom is a set of free wargames rules by Jay Ainsworth for wargames set in the American Civil War. They're based on an original set of Larry Brom rule (duh). It uses a typical Brom card activation system, a random movement distance mechanism, and simultaneous fire.
Pikes and Gendarmes is a set of big battle rules that had their origin as a variant of Larry Brom's seminal The Sword and The Flame. This is set, obviously, in the Renaissance era.