Tmpltr is a Realtime Tinkertool for JSON Templating. Yep, this is another jsFiddle clone. But this is less about JavaScript and more about realtime template binding.

Data is stored as JSON, bound to an HTML template, and styled with CSS. Changes are automatically saved locally to your browser but can also be exported for sharing. Browser allowing, you can drag in .JSON, .HMTL, and .CSS files to be loaded respectively.

Requirements: -
Demo: http://rocktronica.github.com/tmpltr/
License: License Free