Links to DBA & HOTT Adaptations...
DBA 2.1 Pike and Shot Extension by Robert June, Don Jeppson, and Joe Chinnici (in PDF format). Also see Playsheet (Excel)
DBA 1500-1900 Extension (aka Humberside Extensions or DBA-HX), by the Humberside Wargames Society. See also DBA-HX group and Alexei Gartinski's Universal Elements for use with the DBA 1500-1900 extension.
DBA-HX Combat Results Updated to DBA 2.2 (Terry Webb)
NEW DBA-HX 3.0 (1700-1850) (Robert Madrigal)
DBA Renaissance (reference to article in Wargames Illustrated, August 1993)
DBA-RRR by Tony Aguilar (DBA extension for Renaissance, Reformation and Restoration periods, with playsheet and army lists. Accessible through FADBAG Yahoo site)
DBA-RRR on DBA Facebook (public) Alternate location to download https://www.facebook.com/groups/382414395294162/files/
DBA 3.0 ECW: DBTR also DBTR army lists by Pete Duckworth