hackattic - No nonsense, real world programming challenges
Wilco - Developer tool
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
ChatGPT Plugins Developer mode - Built your own plugins on ChatGPT
Takehome - Effective and humane coding challenges for candidates
Bumpsale - Sell your awesome digital product using incremental pricing