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RegExr
RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.
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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.
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Puts Debuggerer
Ruby library for improved puts debugging, automatically displaying bonus useful information such as source line number and source code.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Repl.it - node
Regexr
Github
VS Code - the most popular IDE for JavaScript
u/grantrules mentioned some fantastic resources so you should definitely check those out. I also found most docs and demonstrations very hard to follow at first (it gets easier!) but what helped me was learning the abstract concepts alongside practical applications. Kyle Simpson's You Don't Know JS is free on github and does a great job of teaching fundumental basics, while SuperHi have a great free follow-along course on how to make your own site from start to finish. You don't have to stick to one resource either – pick and choose, switch back and forth, learn, have fun!