free-programming-books/free-programming-playgrounds.md

### Index

* [Angular](#angular)
* [Crystal](#crystal)
* [CSS](#css)
* [FlexBox](#flexbox)
* [Go](#go)
* [Haskell](#haskell)
* [JavaScript](#javascript)
* [Kotlin](#kotlin)
* [.Net](#dotnet)
* [Node.js](#nodejs)
* [Perl](#perl)
* [PHP](#php)
* [Python](#python)
* [R](#r)
* [Ruby](#ruby)
* [Rust](#rust)
* [SQL](#sql)


### Angular

* [Plunker](http://plnkr.co)


### Crystal

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


### CSS

* [CodePen](http://codepen.io)
* [CSSdeck](http://cssdeck.com)
* [CSSdesk](http://cssdesk.com)
* [Dabblet](http://dabblet.com)


### FlexBox

* [Echoplex](http://the-echoplex.net/flexyboxes/)


### Go

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


### Haskell

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


### JavaScript

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


### Kotlin

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


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

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


### NodeJS

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


### Perl

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


### PHP

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


### Python

* [Codepad](http://codepad.org)
* [Pyfiddle](https://pyfiddle.io)


### R

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


### Ruby

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


### Rust

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


### SQL

* [SQLFiddle](http://sqlfiddle.com)


### Scala

* [ScalaFiddle.io](https://scalafiddle.io)
* [ScalaFiddle.net](http://scalafiddle.net)