htmx gives you access to AJAX, CSS Transitions, WebSockets and Server Sent Events directly in HTML, using attributes, so you can build modern user interfaces with the simplicity and power of hypertext

Pushstate aJAX eXtended Replacements

The jQuery Form Plugin allows you to easily and unobtrusively upgrade HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit, gather information from the form element to determine how to manage the submit process. Both of these methods support numerous options which allows you to have full control over how the data is submitted. Submitting a form with AJAX doesn't get any easier than this!

The simple jQuery Plugin for customizable overlay which covers a page, elements or iframe-windows that is specified.

Simple & robust form validation for Bootstrap 3.0, jQuery 2.0.2, Ajax & PHP

mprove the experience of your app when your users lose connection.

Monitors ajax requests looking for failure
Confirms the connection status by requesting an image or fake resource
Automatically grabs ajax requests made while the connection is down and remakes them after the connection is restored.
Simple UI with beautiful themes
3kb minified and compressed

Create easily your own ajax loader icon :

Convert HTML forms into AJAX with jQuery Lightweight - 3 kb uncompressed Tested on: IE6+, Firefox, Chrome, Safari, Opera, and Mobile browsers

<canvas> loaders

Spin.js uses the CSS3 to render the UI, falling back to VML Internet Explorer. If supported by the browser, @keyframe rules are used to animate the spinner.