CSSDesk is a CSS sandbox that allows you to put your HTML and CSS codes there and view the preview instantly. It is very useful for testing out codes before implementing them in your website permanently.
Following tool can use for easy online testing and sharing of database problems and solutions.
1. SQL Fiddle
SQL Fiddle is a tool for easy online testing and sharing of database problems and their solutions. If you do not know SQL or basic database concepts, this site is not going to be very useful to you. However, if you are a database developer, there are a few different use-cases of SQL Fiddle intended for you:
You want help with a tricky query, and you’d like to post a question to a Q/A site
You want to compare and contrast SQL statements in different database back-ends
You do not have a particular database platform readily available, but you would like to see what a given query would look like in that environment
Following tools act as sandbox environment for JSON, XML development, including (E)XSLT, XML validation (DTD, schema, RelaxNG) and XQuery.
XMLPlayground is a sandbox environment for XML development, including (E)XSLT, XML validation (DTD, schema, RelaxNG) and XQuery. It has five development panels into which you can either insert or upload code:
XML – your source XML. You can render it as a node tree via the ‘tree’ tab.
(E)XSLT – transform your XML with XSLT (1.0). EXSLT an XSL includes are supported.
Validation – validate your XML with Schema, DTD or RelaxNG.
CSS – style your output
XQuery – query or transform your XML with XQuery code (via XQIB)