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

### Index

* [Angular](#angular)
* [Crystal](#crystal)
* [CSS](#css)
* [FlexBox](#flexbox)
* [JavaScript](#javascript)
* [.Net] (#dotnet)
* [Node.js](#nodejs)
* [PHP](#php)
* [Python](#python)
* [Ruby](#ruby)
* [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/)


### JavaScript

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


### .NET

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


### NodeJS

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


### PHP

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


### Python

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


### Ruby

* [Codepad](http://codepad.org)
* [Runnable](http://code.runnable.com)


### Rust

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


### SQL

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


### Scala

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