On 31st of May, 2014 (effectively on 31st of July), GameSpy servers were closed. As a result, the in-game browser of OFP/ARMA:CWA stopped working. Thanks to Poweruser's effort it was possible to overcome this difficult situation. Poweruser created a program that alternates the former GameSpy masterserver by a new one that is hosted by PFC (Polish Flashpoint Community). The PFC masterserver has been online since 31st of May, 2014.
PFC's masterserver is the main source of information for OFPMonitor - a program that allows to join OFP/ARMA:CWA multiplayer servers.
PFC hosts a web-based server list that can be found here.