Client-side Development Platforms based on JavaScr

Question

I'd like to set this up as a post where all known JavaScript client development platforms could be listed by company/organization/ecosystem.
* anything that is HTML/JavaScript-based.

Microsoft
Windows Gadgets*
HTA - HTML Applications*

Adobe
Adobe AIR* Can be done with only HTML/JS but can also can use Flex/Flash
Adobe Director
Adobe PDF

Yahoo
Konfabulator

Google
Google Desktop Gadgets - SDK link on the left

Mozilla/Firefox
Greasemonkey
XUL Runner

Appcelerator Titanium

What did I miss? Should I also list JScript.NET, managed JScript, Rhino?

note: I've set this up as a community wiki.

Answer 1

How about Ext Js!

Answer 2

There's also Titanium.

http://www.appcelerator.com/

You can use JavaScript, Python, or Ruby for desktop apps. I believe that mobile apps are JavaScript (no Python or Ruby).

Answer 3

In this context the Universal Widget API might be interesting - it's designed to be a framework to write widgets for different platforms (desktop or online):

http://dev.netvibes.com/

Widgets written with the UWA work on iGoogle, Windows Vista, Apple Dashboard, Live.com, iPhone, and Opera.

Answer 4

Windows Mobile 6.5 (MS Smart Phone OS) will support HTML/JavaScript Widgets similar to Vista/Windows 7 Widgets:

Windows Mobile Developer

Looks pretty interesting.

Answer 5

Qt with QtScript.