"It's a debugger for web pages, like FireBug (for FireFox) and Web Inspector (for WebKit-based browsers), except it's designed to work remotely, and in particular, to allow you debug web pages on a mobile device such as a phone."

push notifications for iphone apps from rails apps

Finally! Great Javascript+CSS scrolling for HTML apps in iPhone. Fixed toolbars, yay!

"ASIHTTPRequest is an easy to use wrapper around the CFNetwork API that makes some of the more tedious aspects of communicating with web servers easier. It is written in Objective-C and works in both Mac OS X and iPhone applications."

The Rhodes framework is a platform for building locally executing, device-optimized mobile applications for all major smartphone devices.

js framework for iphones

"The geo-location-javascript framework gives access to mobile web users location via javascript. It hides the underlying platform specific implementation through a simple unified interface."

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"Rhomobile's open source mobile application framework Rhodes lets you quickly build native mobile applications for allsmartphone operating systems: iPhone, BlackBerry, Windows Mobile, Symbian and Android. These are true native device applications (not mobile web apps) which work with synced local data and take advantage of device capabilities such as GPS, PIM contacts and camera."

iPhone UI class library

" iPhoney gives you a pixel-accurate web browsing environment—powered by Safari—that you can use when developing web sites for iPhone. It's the perfect 320 by 480-pixel canvas for your iPhone development. And it's free."

Wraps your web app in an iPhone app and exposes location and accelerometer data to your web app via javascript