Codeforces is described as 'Website that hosts competitive programming contests' and is an app in the development category. There are more than 10 alternatives to Codeforces for Web-based, Self-Hosted, Mac and Windows. The best Codeforces alternative is LeetCode, which is free. Other great apps like Codeforces are HackerRank, Codewars, AceCoder and octree.io.
Shader Learning is an interactive browser-based platform for learning GPU programming through practical exercises. It offers over 250 challenges in GLSL and HLSL, allowing users to write and test shaders directly in the browser without any setup.
