Joshfire is an open source framework for developing web applications that can work in multiple devices.

It only uses HTML5 + JavaScript and web apps can be built to be compatible with browsers, desktops, smart phones, smartTVs and connected objects.

The content, design and data is separated for a flexible development process and the framework makes use of many popular resources like MediaElement.js or Zepto.js.

Currently, supported devices are desktop browsers, iOS, Android, GoogleTV, SamsungTV and there is an adapter for Node.js as well.

Applications can be controlled with keyboard, mouse, touch, tv-remote and more depending on the capabilities of the device.

The library is improved continuously, documented in detail and comes with various examples.

PhotoSwipe is a free and full-featured image gallery for mobile and touch devices.

It is built with HTML, CSS + JavaScript and doesn't depend on any frameworks.

The interface is native-like and offers a similar experience with the ability of swiping items and support for orientation (also, resizes images automatically).

A "start" button can display the images as a slideshow and there are many options for customizing the gallery like the speed of fadeIn-fadeOut effects, enabling zoom, method of image scaling and much more.

PhotoSwipe works in iPhone, iPad, Android, Blackberry + desktop browsers and there is an optional jQuery implementation for the users of this framework.

When creating a web application or a software, it is usually a good idea to search for resources, like snippets, plugins, etc., that can ease the job.

Cocoa Controls is a website which offers this functionality to iOS and Mac OS X developers by listing open source and custom UI components for these platforms.

There are already 150+ controls (like this awesome iCarousel) where new ones are added regularly. Also, you can submit new resources as well.

P.S. What would be greater is a categorization of the controls so they can be found much easier.

Laker is an open sourced set of files, styles and tips for designing digital publications in HTML5 and converting them into iOS apps.

The project is actually a part of the final thesis of Florian Franke who decided to improve the Baker Framework (like adding "table of contents" and iPhone support) and released the experience + files for free.

It makes use of the Less Framework and can work in both iPhone or iPad in any orientation by resizing itself automatically.

Readers can swipe to change pages, double-tap to view the "table of contents" and use any media like sound, YouTube videos or images.

Simply, Laker can be used to build digital magazines, catalogues, slideshows, surveys and much more.

ChocolateChip-UI is a mobile web app development framework that targets WebKit engines..

The framework provides fully functional widgets and controls right out of the box which know how to behave so you can focus only on providing the data.

A new concept is introduced by the framework: WAML (Web App Markup Language) which is designed for creating mobile web apps and uses special tags + attributes to clearly define all the parts (rather than divs and spans) for a faster development.

ChocolateChip-UI has most of the elements we get used from iOS like the buttons, tab bar, lists, slider and more.

The framework is very well-documented, provides snippets for the basics and definitely a must-bookmark for mobile web app development.

Darran Morris, a creative mobile app. user interface and icon designer, is sharing a set of 64 free icons.

The icons are created with iOS applications in mind and cover most of the icons that an application may need.

Items include actions, player buttons, messages, communication and more.

However, they can be used in websites as well considering the items are very detailed.

They come in 2 sizes: 26*26px and 52*52px, both in transparent PNG formats.

Zepto.js is a lightweight (2kb) JavaScript framework for mobile WebKit browsers, with a jQuery-compatible syntax.

It aims to help overcoming the most drudge work with a nice API so users can concentrate on getting things done.

Besides the most common functions that can be expected from a JS framework, it has support for touch events and detection of the environment.

Zepto.js is currently in early beta but still very promising.

Jo is an open source mobile application framework that is based on HTML5 .

It enables you to create for multiple platforms like webOS, iOS, Android, Symbian, Safari, Chrome and Dashboard Widgets.

The framework is small in size, ~8kb, without any dependencies and compatible with many other JS frameworks.

Jo is also compatible with PhoneGap and makes possible to create native apps besides web apps.

It is very well-documented and has sample codes on every level.

Unify is a software, powered by Deutsche Telekom, which provides a common API developing cross-platform applications that will look and feel like native ones.

It makes use of HTML5, CSS3, JavaScript and other resources like qooxdoo, PhoneGap, Adobe AIR and Sass.

The code can be re-used between platforms and supported ones are iOS, Android, WebOS, Windows and Mac OS.

Unify also eliminates the traditional limitations of the web browser and can detect the current geo location, access the file system, etc.

When developing something in a language that you're not so experienced with, looking for the examples and digging them deeply is a good way of learning.

Same with the iPhone application development and considering it is something new for many developers, viewing the codes of real-world applications and re-using them when needed is very valuable.

Here are 20+ open source iPhone apps to learn and get inspired from: