Hi Micheal,
Lots of good responses. See Margard above for the names.
DBA 12 stand game written by Phil Barker, his wife Sue and Richard Bodley Scott, and released in 1990. It has had a number of iterations and the current (OOP, but downloadable) version is 2.2. Phil and Sue are working on v3, which should be released next year. DBA has a very strong player base.
DBM A more complicated wargame written by Phil and Richard and released a few years after DBA. It uses the same basic mechanisms of DBA, but has many additional mechanisms. Armies usually range from about 50 to 100 stands. The last published version was v3 (OOP), but fans have continued development with Richard and there is a v3.2 (downloadable). Note that Phil does not support DBM anymore and distances himself from it.
DBR Renaissance version of DBM written by Phil and Richard. Released in the mid 1990's it shares many of the mechanisms used by DBM. It was not as popular as DBM (Renaissance games are usually not as popular as ancients anyway), but many DBM players disliked some of the DBR mechanisms, in particular the "My-bound/Your-bound" (MBYM) mechanisms where combat outcomes changed depending whose side's bound it was. I believe it is up to v2.
DBMM Phil's replacement for DBM. Released in the mid- 2000's it has not been as popular as DBM. Many DBM players disliked the mechanisms (ie: MBYB) and continued to play DBM (see above), and many have moved on to other games. It is as complicated, if not more complicated than DBM (this is all relative mind you, I don't find it particularly complicated at all). The latest version is v2, and player numbers are slowly increasing (mainly in the UK). DBMM is practically non-existant in the USA. I will admit that this is my favourite game.
HOTT Hordes of the Things Fantasy game written by Phil, Sue and Richard, released in the 1990s and based on DBA. Latest version is v2. Very nice game.
DBN not a Barker game, as mentioned above
There is a great many DBA extensions around to allow people to play DBA in later periods (eg: DB-RRR) that you can download. None of these are "official", but many are quite good.
There are also;
HFG Horse, Foot and Guns Phil's draft DBA version for the Horse and Musket era (downloadable). Many of the mechanisms in this game made it to DBMM first. It actually looks nothing like the DBA versions that the fan's wrote.
DBSA Damn Battleships Again Phil's play-set for pre-Dreadnaught naval (downloadable). A fun game, not finished and I doubt it will ever be published.
Subs and Sams, Sharp End, DBV, all half-finished games littering Phil's WRG website;
wrg.me.uk/WRG/wrgindex.html
Hope this helps, happy to discuss anything. Oh, and John, here is your bird back;