Math Jax
Beautiful math in all browsers
Webfontloader
WebFont Loader gives you added control when using linked fonts via @font-face.
Fit Text.js
A jQuery plugin for inflating web type
Cufon
Fast text replacement with canvas and VML - no Flash or images required.
Textillate
A simple plugin for CSS3 text animations
Lettering.js
A lightweight, easy to use Javascript <span> injector for radical Web Typography
Flow Type.js
Web typography at its finest: font-size and line-height based on element width.
Typefont
The first open-source library that detects the font of a text in a image.
Balance Text
A jQuery plugin for implementing balancing of wrapping text in a web page
Big Text
jQuery plugin, calculates the font-size and word-spacing needed to match a line of text to a specific width.
Blast
Blast text apart to make it manipulable.
Kerning.js
Take control of your web typography.
Lining.js
An easy to use javascript plugin offers you complete DOWN-TO-THE-LINE control for radical web typography.
Jquery.typer.js
A simple jQuery plugin for a slick typing effect.
Baseline.js
A simple jQuery plugin for restoring vertical baselines thrown off by odd image sizes
Trmix
apply CSS based on your browser's text rendering engine
jQuery Webfonts
jQuery based Webfonts library