Less2CSS
http://www.less2css.org
Website is open-source: http://github.com/brian-frichette/less-preview
My co-worker and I needed the same functionality, so we whipped up this online compiler.
Highlights:
- CSS is updated in real-time, as-you-type, completely client-side.
- You can choose between LESS versions (ie. v1.3.3, v1.3.0, etc)
