freeCodeCamp
Description: freeCodeCamp is a free, open source coding platform that offers interactive coding challenges and projects to help people learn web development. It has a large community of developers and allows users to earn certifications.
Type: software
Pricing: Open Source
Sphere Contest
Description: Sphere Contest is an open-source software for running contests and competitions online. It allows organizers to easily create contests with different categories, accept submissions from participants, have judges score the entries, and automatically calculate final results.
Type: software
Pricing: Open Source