Biggest library of ready-made API collections for Postman
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Quiz maker for teachers to create their own tests, assign points, password protect quizzes, monitor results and export to CSV. Had a couple of initial launch sales, and one sale every once in a while, but I've had no time to market and promote this.
Productivity all-in-one solution: lists, timers, motivators.
A facebook bot to track all the latest tokens, ICOs and cryptocurrency news