Battlefield Pirates 2 is a full conversion mod for Battlefield 2. The game pits 2 two rivaling crews, the Undead and the Peglegs, in a vicious battle for control of the Caribbean and all its booty. A new version bringing new maps, larger sea vessels, new game modes and more was recently released! Read more on the official homepage!
You can download the mod from here or here. The following (unranked) servers are hosting the Pirates 2 Yarr 2.1 mod:

Australia
GameArena - 144.140.154.117:16567

Europe
TV2 battle.no - 193.160.156.185:16568
i3d.nl - 84.244.186.163:16567

South Africa
HypeGamez.co.za - 66.8.59.17:16567

United Kingdom
Game-Serve.co.uk - 77.74.192.196:16567
Multiplay.co.uk - 85.236.102.7:17267
Multiplay.co.uk - 85.236.102.7:17067

USA
WOLFServers.com - 64.34.184.35:18567
Clanwarz.com - New York: 72.26.198.60:16567
Clanwarz.com - Chicago: 216.246.110.200:16567
Clanwarz.com - Texas: 208.43.14.91:16567
UGS-Battlefield Pirates2 - Central USA: 69.28.220.193:16567
UGS-Battlefield Pirates2 - Western USA: 69.90.189.130:16567
UGS-Battlefield Pirates2 - Eastern USA: 72.5.86.180:16567

Two DICE team members will be online to play Pirates 2 on Thursday January 16 at 17:00 GMT, keep an eye out for DICE-Parker and DICE-Bazajaytee. As cannon fodder we are also bringing EAUK-Lazarus from the EA UK staff!