Wikipedia
Upwork
Upwork, formerly Elance-oDesk, is a global freelancing platform where businesses and independent professionals connect and collaborate remotely. In 2015, Elance-oDesk was rebranded as Upwork. It is based out of Mountain View and San Francisco, California.
Upwork has twelve million registered freelancers and five million registered clients. Three million jobs are posted annually, worth a total of $1 billion USD, making it the world's largest freelancer marketplace.