Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 – 1000x, depending on your architecture.
Famo.us is a full-fledged mobile app framework built around a physics engine.
GSAP is a fast, multi-purpose animation platform. It inspired me to pursue the development of Velocity.
Velocity is a very fast and lightweight tool for dramatically improving UI animation performance and workflow.
http://julian.com/research/velocity/ – documentation