Bill MacGillivray has a nice gallery of his Shang Chinese DBA army, and a Dragon Tail banner for you to save and print on your inkjet.The banner is in 15mm, but I’m going to resize it and use it for my Boxer Rebellion armies in 28mm.
DBA
English Civil War DBA Variant
The Solitary Wargamer offers a variant of DBA for the English Civil War.
DBA 3 Reference Sheet
The Society of Ancients offers a free DBA 3 reference sheet.
DBX Colonial Rules
Pushing Tin offers a set of colonial rules in the DBX style.
Napoleonic DBA Rules
Steve Burt has a set of free wargames rules for playing Napoleonics using DBA mechanics.