mixin.less supplies a lot of utility mixins to use into your LESS projects to write less and more DRY code.
There are mixins for block and inline-block cross-browser compatibility, masking items, absolute positioning shortcuts, create sprites easily.
There also are mixins to easily implement CSS3 behaviors without need to remember all browser-specific prefixes!
IMPORTANT:
This repo also contains an index.html file. Duble click on it to open a complete set of examples and documentation to learn how to use provided mixins.