Zurb has built an impeccable reputation from their Foundation framework which is soon to see a Foundation 6 release.
The team has been busy as they also recently open sourced a Sass animation library that was previously apart of Foundation for Apps.
Motion UI is built in Sass and includes over 24 built-in transitions/animation effects. The animated effects are controlled via Sass mixins and some quick CSS classes for simpler animations like sliding or fading.
To give this a spin yourself just visit the Motion UI playground
If you want to get this up & running for a new project you should reference the official documentation found in the Motion UI repo.