Description: Brilliant.org is an online platform that offers math and science problems and courses to help people improve their logical reasoning and problem-solving abilities. It uses interactive quizzes and puzzles to make STEM subjects more engaging.
Type: software
Description: Debuggex is a free online visual regex tester. It allows you to visually construct regex patterns and test them against input strings to see if there is a match.
Type: software
Pricing: Free