From their Github (https://github.com/garris/TremulaJS): Picture Streams + Momentum Engine + Bézier Paths + Cross-Browser + Cross-Device

TremulaJS is a client-side javascript UI component providing Bézier-based content-stream interactions with momentum & physics effects for mouse, scroll and and touch UIs.

Put another way, TremulaJS can be thought of as an extremely bad-ass image carousel.