📚 Freely available programming books
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### Index
* [Angular](#angular)
* [Crystal](#crystal)
* [CSS](#css)
* [FlexBox](#flexbox)
* [JavaScript](#javascript)
* [.Net] (#dotnet)
* [Node.js](#nodejs)
* [Perl](#perl)
* [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/)
### Haskell
* [Try Haskell] (https://www.tryhaskell.org)
### 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)
### Perl
* [Perl](http://tryperl.pl)
### 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)