Wikipedia
ProZ.com
ProZ.com is a membership-based website targeting freelance translators. Founded in 1999, it is mainly used for posting and responding to translation job offers. , ProZ.com reports more than 720,008 registered users, spanning more than 200 countries and territories worldwide.
The site is available in more than 45 languages and is being localized in 35 other languages, although localization is not complete for many languages, the default setting being English. QuantCast reports ProZ.com has 220k monthly unique U.S. visitors.
The website is not restricted to professional translators and hosts a number of semi-professional and amateur translators. It is open to anyone, without proof of competency or legal registration.