Datastar is a lightweight framework for building everything from simple sites to real-time collaborative web apps.

Tachyon animate by Andrew Nater is a single purpose classes to help you orchestrate CSS animations.

Easily create sites that work offline as well as online. UpUp is a tiny JavaScript library that makes sure your users can always access your site's content, even when they're on a plane, in an elevator, or 20,000 leagues under the sea.