The Solitary Wargamer offers a variant of DBA for the English Civil War.
dba
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.
Greek Village Model
Eye candy time. Greg Kelleher has built a nice greek village for DBA.
Battle Drills and Tactics for DBM
Judging from the number of games I’ve seen at conventions, De Bellis Multidudinus (DBM) is probably the most popular ancients game out there. Unfortunately, it’s written in an obscure dialect of English known as Barkereese. Linguists contend that the form originally developed as a form of cryptography, allowing the Angles to the Saxons in the dark. Unfortunately, it also keeps gamers from knowing exactly what the author intended. As a result, many scholars have dedicated their websites to explaining it all. This site is full of diagrams explaining DBM’s concepts to those not fluent in Barkereese.