De Bellis Horribilis is a set of free wargames rules for The Great War based on DBA.
DBA Variants
De Bellis Indica DBA Colonial Variant
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
DBA Variants
Chris Brantley has collected this list of rules variants for the De Bellis Antiquitatis (DBA) ancients miniature wargame.