Apps similar to Umbrella JS include jQuery, which is free and open source. Other options are DHTMLX, Zepto.js, Underscore.js and Derby. Software Frameworks like Umbrella JS are a crowded field, with more than 25 alternatives for Windows, Linux, Mac, the web and self-hosting.
Small & fast DOM and event library for modern browsers. Having the same familiar API as jQuery (but without the extra "weight" of modules like $.ajax, $.animate, and $.Deferred), it works great stand-alone or paired up with e.g. Backbone.
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
qooxdoo is a universal JavaScript framework that enables you to create applications for a wide range of platforms. With its object-oriented programming model you build rich, interactive applications (RIAs), native-like apps for mobile devices, light-weight traditional web...
Yaf is the first PHP MVC framework which is written in C and built as PHP extension. It is considered the fastest and the lowest resource consuming PHP framework for now. It is well tested and has been applied successfully in many high traffic products in Baidu, Sina and other...
Small components for building apps, manipulating data, and managing a distributed application.
Nombo is an Open Source Node.js framework that allows you to easily build Rich Cloud Applications.
Wink Toolkit is a lightweight JavaScript toolkit which will help you build great mobile web apps. It is designed and developed to meet the specific constraints of the mobile environment.
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