CodeSignal - CodeSignal is the leading assessment platform for technical hiring.
Make It Rain - Random gifs when you get paid via Stripe (Slack and Hipchat)
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.
Darts Club: PvP Multiplayer - Darts Club: PvP Multiplayer is an amazing player versus player gaming app with a collectible twist.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Red Stamp Cards - Red Stamp Cards is a fabulous mobile app that facilitates its users to greet their friends and family with excellent paper cards and notes.