What's a very useful website that no one knows about?

This page summarizes the projects mentioned and recommended in the original post on /r/AskReddit
RegExp internet-archive open-source Books library-catalogue

SurveyJS
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  • RegExr

    RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.

    • https://regexr.com/ Is a website that helps you code and test you regular expressions live. It also has an easy index of helpful functions along the side. It’s awesome.

  • openlibrary

    One webpage for every book ever published!

    • https://openlibrary.org/ Millions of scanned books you can borrow. Not a pirate site — archive.org holds physical copies of  the books they loan out. There are also mobile apps if you don’t want to read in your browser.

  • SurveyJS

    Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

    SurveyJS logo

  • learnxinyminutes-docs

    Code documentation written as code! How novel and totally my idea!

    • https://learnxinyminutes.com/ For all things programming, learn how to write and read programming for 20+ languages.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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