This plugin adds client-side validation to the WordPress comment form, using the jQuery validation plugin.
AngularJS for WordPress allows you to easily leverage the power of AngularJS and put it into your theme.
WordPress Plugin to columnize content automatically
This plugin allows you to create AJAX applications by simple way. It implements JSON data transfer, data escaping, error handling.
SiteBrains blocks spam posts using a completely configurable set of rules. Both interactively as the user types and on our servers upon submission.
Use the Chat Rooms plugin to have chat rooms added to your site, powered by Firebase and AngularJS.
qTwit is a WordPress widget that loads Tweets (from Twitter) on the client-side, via jQuery, as opposed to on the server.
Last.wp is a WordPress widget that shows your guests what you've been listening to on Last.fm, via a jQuery plugin!