A set of useful mixins for LESS, the CSS pre-processor: http://lesscss.org
More information and usage examples over at: http://lesselements.com
Examples page of all the mixins here: http://lesselements.com/tests
Oreolek has a good fork with the mixins organized under namespaces here: https://github.com/Oreolek/elements I recommend going with that if you use other frameworks like Bootstrap to avoid clashes.
TextMate bundle: https://github.com/juanghurtado/less-elements.tmbundle
Ruby gem to work with Rails: https://github.com/krasnoukhov/lesselements-rails
License: This work is dedicated to the public domain and is free for all uses, commercial or otherwise. No form of credit required.