funkcss 
Flexible
Following strict yet simple conventions it's easy to extend funkcss to suit almost any project.
No side-effects
With immutable helpers it will apply your style not matter in what context.
Handly
Following emmet naming convention: .ta-c is text-align: center; it is really easy and intuitive to type.
Contributing
Read our contributing guide if you're looking to contribute.
License
MIT © Filipe Linhares