Cufon
Fast text replacement with canvas and VML - no Flash or images required.
Webfontloader
WebFont Loader gives you added control when using linked fonts via @font-face.
Author Marks
JavaScript to toggle highlighting HTML5 'mark' tags, to emphasise con tent.
jQuery Webfonts
jQuery based Webfonts library
Trmix
apply CSS based on your browser's text rendering engine
Fit Text.js
A jQuery plugin for inflating web type
Blast
Blast text apart to make it manipulable.
Balance Text
A jQuery plugin for implementing balancing of wrapping text in a web page
Typefont
The first open-source library that detects the font of a text in a image.
Big Text
jQuery plugin, calculates the font-size and word-spacing needed to match a line of text to a specific width.
Baseline.js
A simple jQuery plugin for restoring vertical baselines thrown off by odd image sizes
Math Jax
Beautiful math in all browsers
Kerning.js
Take control of your web typography.
Jquery.typer.js
A simple jQuery plugin for a slick typing effect.
Text Tailor.js
jQuery plugin, tailor made text to fill the height of the parent element or ellipse it if it doesn't fit
Flow Type.js
Web typography at its finest: font-size and line-height based on element width.
Textillate
A simple plugin for CSS3 text animations