
Description: Project Euler is a website dedicated to a series of computational problems intended to be solved with computer programs. The problems involve mathematics and logic puzzles that require knowledge of math and programming to solve.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Codewars is an educational community for computer programming. It offers code challenges known as kata which are ranked by difficulty. Users train on these coding challenges to improve their skills.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API