In this post I want to suggest you some free resources which allow developers to quickly build and mantain powerful and advanced AJAX web applications. In this list you can find advanced grid features, calendars, tab-strip and a lot of other interesting components to develop and enrich your AJAX web applications.


DHTML eXtensions
dhtml eXtension provides a set of cross-browser DHTML components for building advanced and powerful Ajax-based web interfaces. It includes advanced grids, trees, color picker, calendar, editor, combo box, advanced layout features and a lot of other interesting components to enrich your web applications. You can download the standard edition for free.

Google Web Toolkit
Writing web apps today is a tedious and error-prone process. Developers can spend 90% of their time working around browser quirks. In addition, building, reusing, and maintaining large JavaScript code bases and AJAX components can be difficult and fragile. Google Web Toolkit (GWT) eases this burden by allowing developers to quickly build and maintain complex yet highly performant JavaScript front-end applications in the Java programming language.

Nitobi Complete UI
Nitobi Complete UI is an open source ajax components for building Ajax-powered Web user interfaces that improves user experiences for any Web 2.0 application. It include a powerful Ajax datagrid, with Excel copy and paste, in-place cell editing, and live scrolling; an Ajax-powered tab-strip component with native support for other Nitobi components, client-side statefulness, and skinnability; a full featured Calendar component with support for multi-month view, easy localization, databound events, and more.

Clean-Ajax
Clean-Ajax is an open source engine for AJAX, that provides a high level interface to work with the AJAX technology. It can be plugged in any page or DHTML framework because it was designed in conformation with the separation of concerns principle, keeping focus on AJAX issues. It's simple to install, to configure and to use;

SmartClient
SmartClient is globally deployed in thousands of enterprises, and has been incorporated as a core technology in major shipping products since 2002. SmartClient provides a zero-install DHTML/Ajax client engine, rich user interface components and services, client-server databinding systems. All components can be easily embedded in existing applications: grids, forms, trees, dialogs, wizards and other components can be added without making architectural changes.

Ample SDK
Ample SDK is a unique piece of software that runs transparently in the layer between web browser and your application. While running it provides the Logic of your application with standard cross-browser access to the User Interface. Ample Runtime, UI languages and programming model are all based on open standards. Thus a web-developer doesn't need to learn any new technologies or proprietary APIs. He can simply keep using already learnt JavaScript language, DOM, CSS, XML, XHTML and other technologies and standards.

Sigma Visual Ajax GUI Builder
Sigma visual builder is a web based tool for AJAX RIA application UI rapid design and involved scripts programming.You can do everything by drag & drop with a significant development time reduction. It provides more than 40 common components, including Tabs, Dialog, TreeGrid, TimeLine and many other web GUI components.It's also compatible with jQuery, prototype, mootools and other javascript frameworks.

SAJAX
Sajax is an open source tool to make programming websites using the Ajax framework as easy as possible. Sajax makes it easy to call PHP, Perl or Python functions from your webpages via JavaScript without performing a browser refresh. The toolkit does 99% of the work for you so you have no excuse to not use it.

ZK - Direct Ria
ZK is the most proven Ajax + Mobile framework designed to maximize enterprises operation efficiency and minimize the development cost. With groundbreaking Direct RIA architecture, ZK simplifies and speeds the creation, deployment and maintenance of rich Internet applications.

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