📚 Freely available programming books
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### 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)