Have you ever wanted to trouble shot someone else web page which contains the combination of JavaScript, CSS and HTML? Have you ever wanted to troubleshoot someone else SQL query without entering to the SQL server? Here are some useful online tool which make your life easier.

Following tools provide an online debugging environment for HTML, CSS and JavaScript.

1. http://jsfiddle.net/

2. http://jsbin.com/

3. http://cssdesk.com/

4. http://codepen.io/pen/

Following tool can use for easy online testing and sharing of database problems and solutions.

1. http://sqlfiddle.com/

Following tools act as sandbox environment for JSON,  XML development, including (E)XSLT, XML validation (DTD, schema, RelaxNG) and XQuery.

1. http://xmlplayground.com/

2. http://jsonfiddle.net