YAM - Video Q&A platform where you can get paid to ask or answer questions.
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Daily Coding Problem - Get exceptionally good at coding interviews
Fishoal - Fishoal is the next-generation Q&A platform that helps anyone who needs help to find validated answers by connecting people to certified experts that can help.
HackerEarth - HackerEarth is the network of top developers across the world. They connect to start-ups, tech companies, organizations and discover the best developer jobs. They participate in programming challenges and compete against other top developers.