Compile Your *.less Files Into Valid CSS: SimpLESS
LESS is a great language for writing styles faster and getting more out of CSS with its dynamic nature (variables, mixins, operations and functions).
SimpLESS brings another option for designers willing to generate the CSS from .less files quickly.
It is a desktop-app that has versions for Windows, Mac OS X + Linux and works simply by drag 'n' dropping your project files into the app and getting the CSS output.
P.S. SimpLESS is also an open source project.