Photos: Five virtual worlds you need to know about

Qwaq is essentially a virtual office where teams within organisations can work together even if they aren't in the same physical office.

One of its most interesting tools is Qwaq Forums, a virtual project management environment which allows people to place different document formats on a notice board and share and discuss ideas through instant messaging and voice communication.

Qwaq can also be used for businesses to communicate with their clients and customers to give them updates on projects they're working on, as well as deliver training to staff.

Picture credit: Qwaq