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