Code Sandboxes and Fiddles

If you need to quickly test your idea in code and don't want to create a full project, then you will find these sandboxes, codepens and fiddles useful.

Multi Language

ideone :Online Compiler and IDE
codepad : Online Compiler / Interpreter.
coding ground : Coding Ground for Developers.
JDoodle : IDEs for several languages.
Regex : Practice your regex here.

Languages

Code Pen : For HTML, CSS and JavaScript. Very good for trying out a new bit of HTML or CSS on its own before it goes into a page, with the result updating as you type.
Fiddle Salad : For HTML, CSS and javascript.
JS Bin : For HTML, CSS and javascript.
JS Fiddle : For HTML, CSS and javascript.
JDoodle : Pascal Compiler.
rextester : Compile Pascal Online.
PHP Tester : For PHP. Amazing for testing a function or a snippet without setting up a server, especially when you are just starting with the language.
php-fiddle : For PHP.
Proose : For PHP.
Python Cloud : For Python.
regexr : For Regex.
Ruby Fiddle : For Ruby.
JDoodle : For LUA.
Lua Demo : Try before downloading it.

Database

dbfiddle.uk : For many many databases.
db-fiddle.com : For mySQL, PostgreSQL and SQLite.
sqlfiddle : For a variety of SQL dialects. We use it to get the syntax of a statement right and try it on sample data before it goes anywhere near a live database.

Online Playgrounds for JavaScript, PHP, Python, SQL and More

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