What is your best rich web app development tool?

[umrashrf]

I am interested to know your best tool for rapid yet maintainable rich web app development. I know few tools and would like to poll on them.

1. Ext JS (http://www.sencha.com/products/extjs/)

2. qooXdoo (http://qooxdoo.org/)

3. Cappuccino (http://cappuccino.org/)

4. HTML5 and CSS3

[adamlindsay]

Surprised Backbone.js(http://documentcloud.github.com/backbone/) didn't make the list.

[umrashrf]

I just had heard the name. I didn't know it's for frontend development.

[xxqs]

I've built a couple of applications with Qooxdoo, and found it fairly simple, especially for the one like me, who was never programming any serious JS before. I still dislike javascript, but that's a different story :)

[jph]

Sencha is great. I wrote demo apps for Sencha associations, grids, MVC, REST, XTemplates, etc.

http://github.com/sixarm

Then search for "sixarm_sencha"

[umrashrf]

I am already using Sencha Touch so I believe Ext JS would do the job but then their commercial license would need to be bought. MIT license is great.

[kls]

If you are looking for fast end to end modern web apps you should look at wavemaker, VMWare picked them up. For just knocking out quick REST / js CRUD apps they are in a league of there own.

[vlastik]

http://sproutcore.com/

[bkyan]

#4 for me, although jQuery is what is really doing all the heavy lifting.

[amirf]

+1 to that.