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Web apps // Websites


  • CodeWars

    Let's you solve problems with code. Ranking system and social hub implemented. IMHO the best site to learn new languages.

  • LeetCode

    Geared more towards common technical interview questions and expanding knowledge level.

  • Project Euler

    Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

  • CodinGame

    Try Clash of Code mode - battle against your friends in problem solving tasks.


  • Clone Wars

    100+ open-source clones and alternatives of popular sites like Airbnb, Amazon, Instagram, Netflix, Tiktok, Spotify, Whatsapp, Youtube, etc.


In-browser code execution


Developer Portals


  • SourceGraph

    Search all open-source code using regex or full text search. Useful for finding code examples of XYZ library or function.


    Similar to SourceGraph; seems to have less repos indexed, but is faster

Desktop Apps

IDEs // Editors

API testing

PDF viewers // editors

Code snippets


  • NeutrinoAPI

    General purpose API; collection of various tools