Toptal enables start-ups, businesses, and organizations to hire freelancers from a growing network of top talent in the world.

Freelancer is a global crowdsourcing marketplace website, which allows potential employers to post jobs that freelancers can then bid to complete.

Upwork or Elance-oDesk is a global freelancing platform where businesses and independent professionals connect and collaborate remotely.

USource is a outsource platform for digital marketing.