free-programming-playgrounds.md

### Index

* [Angular](#angular)
* [ClojureScript](#clojurescript)
* [Crystal](#crystal)
* [CSS](#css)
* [Elm](#elm)
* [Go](#go)
* [Haskell](#haskell)
* [Ionic](#ionic)
* [Java](#java)
* [JavaScript](#javascript)
* [Kotlin](#kotlin)
* [.Net](#dotnet)
* [Node.js](#nodejs)
* [OCaml](#ocaml)
* [Perl](#perl)
* [PHP](#php)
* [Python](#python)
* [R](#r)
* [React](#react)
* [Ruby](#ruby)
* [Rust](#rust)
* [RxJS](#rxjs)
* [Scala](#scala)
* [SQL](#sql)
* [Svelte](#svelte)
* [Swift](#swift)
* [TypeScript](#typescript)


### Angular

* [Plunker](http://plnkr.co)
* [StackBlitz](https://stackblitz.com/fork/angular)


### ClojureScript

* [Web REPL](http://clojurescript.net)


### Crystal

* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)


### CSS

* [CodePen](https://codepen.io)
* [CSSdeck](http://cssdeck.com)
* [CSSdesk](http://cssdesk.com)
* [Dabblet](http://dabblet.com)
* [Flexy Boxes](http://the-echoplex.net/flexyboxes/)


### Elm

* [Ellie](https://ellie-app.com)


### Go

* [Go Playground](https://play.golang.org)


### Haskell

* [Try Haskell](https://www.tryhaskell.org)


### Ionic

* [StackBlitz](https://stackblitz.com/fork/ionic)


### Java

* [repl.it](https://repl.it) (_including a separate Java/Swing_)


### JavaScript

* [CodePen](https://codepen.io)
* [CodeSandbox.io](https://codesandbox.io)
* [JSBin](http://jsbin.com)
* [JSFiddle](http://jsfiddle.net)
* [Plunker](http://plnkr.co)
* [Sololearn](https://code.sololearn.com/#html)


### Kotlin

* [Kotlin](https://play.kotlinlang.org)


### <a name="dotnet"></a>.NET

* [.NET Fiddle](https://dotnetfiddle.net)


### NodeJS

* [Ideone](http://ideone.com)


### OCaml

* [Try OCaml](https://try.ocamlpro.com)


### Perl

* [Perl](http://tryperl.pl)


### PHP

* [Codepad](http://codepad.org)
* [PHPFiddle](http://phpfiddle.org)
* [PHPTester](http://phptester.net)


### Python

* [Codepad](http://codepad.org)


### R

* [R-Fiddle](http://www.r-fiddle.org)


### React

* [CodeSandbox.io](https://codesandbox.io)
* [StackBlitz](https://stackblitz.com/fork/react)


### Ruby

* [Codepad](http://codepad.org)


### Rust

* [Rust Playground](http://play.integer32.com)


### RxJS

* [StackBlitz](https://stackblitz.com/fork/rxjs)


### Scala

* [ScalaFiddle.io](https://scalafiddle.io)
* [ScalaFiddle.net](http://scalafiddle.net)
* [Scastie](https://scastie.scala-lang.org)


### SQL

* [Extends Class](https://extendsclass.com/sqlite-browser.html)
* [SQLFiddle](http://sqlfiddle.com)


### Svelte

* [StackBlitz](https://stackblitz.com/fork/svelte)


### Swift

* [Online Swift Playground](http://online.swiftplayground.run)


### TypeScript

* [Playground](https://www.typescriptlang.org/play/index.html)
* [StackBlitz](https://stackblitz.com/fork/typescript)