Sparrow is an Objective C framework used for developing games on iPhone.

Sparrow is made in a way that allows completely skipping OpenGL coding–unless you really want to switch.

The framework’s main features are:

• Intuitive coding and easy to learn (Flash, Java, etc developers will love this!)
• Great performance (Sparrow can animate several hundred textured quads at 50+ fps)
• Numerous projects have already been developed with Sparrow (see ‘in action’)

iWebkit is a nice, specialized framework that helps creating simple web applications for iPhone and iPod touch.

What’s so great about iWebKit is that it can be used both by professional web developers and by complete newbies.

Furthermore, iWebKit comes with an extensive user manual that will get you started in no time.

The pages created with iWebKit are neatly styled and consume little bandwidth; they can be created in a matter of minutes, and act as a great supplement to your default webpage, as RSS feeds can be added easily.

• Website: http://iwebkit.net/
• Demo: http://iwebkit.net/demo

Titanium is a cool application development platform made by Appcelerator Inc..

It supports development with web programming languages like avascript, HTML, CSS, Python, Ruby, and PHP.

You can build applications for mobile, desktop, and tablets while still having a near-native performance. Which means that applications built with Titanium. The mobile version alone has over 300 APIs you can work with.

Be sure to watch the showcase video to see what the Titanium platform is really capable of.

• Website: http://www.appcelerator.com/

jQTouch is a jQuery plugin for mobile web development.

As the name implies, it works on iPhone, iPod Touch; Android support is to be implemented soon.

The main features of jQTouch are all that of jQuery’s, plus:

• Native WebKit animations
• Flexible themes
• Swipe detection (hence the ‘Touch’)
• Widely available extensions, etc

Although it is similar to Sencha Touch, jQTouch is made for developing simpler, smaller mobile apps than Sencha–and rightfully so, as jQTouch is and will remain free under the MIT license.

Read this post by the developer of both for an in-depth comparison.

• Website: http://www.jqtouch.com/
• Demo: http://www.jqtouch.com/preview/demos/main/

Sencha Touch is a framework for developing HTML5 apps on mobile. This framework is – at least it seems so – ideal for developing applications on mobile.

The framework supports iOS and Android, and is continuously improving mobile OS support.

Touch is a combination of the Ext JS, jQTouch and Raphaël frameworks, and is still up for free until a trial license is introduced.

The main features:

• Enhanced Touch Events
• Data Integration
• Web Standard compliant code
• Myriad HTML5 features (animations, icons, etc)
• Resolution independence

• Website: http://www.sencha.com/products/touch/