- C
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- JDoodle - Online Java Compiler Advanced IDE
- JDoodle - Online Java Compiler IDE
- Programiz - Online Java Compiler
- repl.it (including a separate Java/Swing)
- SoloLearn
- CodePen
- CodeSandbox.io
- Esfiddle
- Grasshopper (Google account required)
- Hello Website - (Glitch) (Account requested, not required)
- JSBin
- JSFiddle
- Plunker
- SoloLearn
ℹ️ See also … Angular
- Nim Playground - nim-lang.org
- Hello Node - (Glitch) (Account requested, not required)
- Ideone
- SoloLearn
- Codepad
- Programiz.com
- Python Trinket
- Python.org Shell
- Repl.it - NiceDualPoint
- SoloLearn
- Try Python - Jakub T. Jankiewicz
- CodeSandbox.io
- Hello React - (Glitch) (Account requested, not required)
- jscomplete
- StackBlitz
- iHateRegex: regex for playground - Geon George
- Regex Tester and Debugger Online - Javascript, PCRE, PHP - Dan's Tools
- Regex101: build, test, and debug regex - Firas Dib (regex101.com)
- RegExr: Learn, Build, & Test RegEx - GSkinner Inc.
- V Playground - vlang.io
ℹ️ See also … AngularJS