Bots vs Browsers - Public Bot / User Agent Database & Commentary
Bots vs Browsers - database of 16,270,849 user agents and growing
User Agent Details for "Mozilla/5.0+(Windows;+U;+Windows+NT+5.1;+ru;+rv:1.9.0.19)+Gecko/2010031422+Firefox/3.0.19+(.NET+CLR+3.5.30729)+sputnik+2.5.3.31"