Make It Rain - Random gifs when you get paid via Stripe (Slack and Hipchat)
PingPong UX - The easiest way to run remote user research. Test your product with users worldwide & create experiences they'll love.
Knife Bounty - Knife Bounty is an exciting gaming app that provides you a variety of knife hitting and shooting games.
Testbirds - Testbirds is a crowdtesting platform with a community of 100,000 testers
Wintub - Wintub is one of the popular spots to earn money for watching videos and get cash from Paypal, WebMoney, Bitcoin, and other platforms.
Mockito - Mocking framework for unit tests in Java.