sIFR : sIFR is meant to replace short passages of plain browser text with text rendered in your typeface of choice, regardless of whether or not your users h...
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
Cufón aims to become a worthy alternative to sIFR, which despite its merits still remains painfully tricky to set up and use.