Prey is an open source anti-theft software for Mac, PC & Mobile that lets you keep track of your phone or laptop at all times, and will help you find it if it ever gets lost or stolen.

Prey is 100% geolocation aware, it uses either the device’s GPS or the nearest WiFi hotspots to triangulate and grab a fix on its location.

It can take a picture of the thief with your laptop’s webcam so you know what he looks like. It’s lightweight, open source software, and free for anyone to use.

Sencha Animator is a powerful desktop application with an intuitive graphical user interface (GUI), including an interactive timeline and object property controls to create awesome CSS3 animations for WebKit browsers and touchscreen mobile devices.

With Sencha Animator, you can create CSS3 ads that rival rich-media ads made with traditional desktop applications. You can animate text and images with smooth transitions, design buttons with gradients, and embed analytics tracking code. All with the power of web standards.

This CSS3 alternative to Flash is free for now but it will cost on a per user basis.

Jo is an Open Source HTML5 Mobile App Framework for building mobile applications for HTML5 capable browsers and devices.

It was originally designed to work on mobile platforms as a GUI and light data layer on top of PhoneGap. Jo has been tested successfully as a lightweight framework for mobile browsers, newer desktop browsers, and even Dashboard widgets.

Jo Features

• Cross platform HTML5 Mobile Framework - Tested with webOS, iOS, Android, Symbian, Safari, Chrome and Dashboard Widgets
• Lightweight and efficient
• Animations and transitions using CSS3

Webdesignshock is sharing an Android PSD GUI Set to implement on Android that will make your system standout in front of the rest. The Andriod PSD GUI set comes both in Common and Sense versions.

The package includes fully editable Photoshop (PSD) files, original fonts and previews, everything that you may need in order to customize your set according to your preferences.

ProtoFluid is a free web based tool that instantly lets you test web applications or websites on various screen sizes, orientations and browsers, particularly mobile devices. ProtoFluid is particularly suited to the early development of fluid layout based web applications.

Input the URL, select the screen size and the device (iPhone, Droid, Nexus One or iPad) and preview your website.

Features

• Lets you design for CSS3 compliant (mobile) browsers using Media Queries
• Encourages modern design flexibility
• Use all your favorite web browser development tools (Firebug etc.)

MobilePress is a free WordPress plugin which turns your WordPress blog into a mobile-ready blog when viewed on a cell phone.

MobilePress comes with a number of free themes optimized for normal handsets and also an iPhone specific theme. It also allows you to create custom mobile themes for different handheld devices and mobile browsers such as the iPhone, Opera Mini and Windows Mobile.

baseJS is a lightweight Javascript mobile framework intended for use with Mobile Safari on the iPhone and iPod Touch; it also works with Firefox and all WebKit-based browsers.

By providing shortcuts and reusable methods, baseJS helps you write code to be lightweight and expendable, perfect for the mobile web.

Features

• Falls back on Sizzle selector library for iPhone 1.x (if query selector support unavailable)
• Encourages use of CSS Transitions and Animations
• Object-oriented mobile javascript framework
• Easy to extend

baseJS is not useable with Internet Explorer.

Sencha Touch – An HTML5 Mobile Application Development Framework that offers mobile application developers easy access to the powerful HTML5 technologies, including Geolocation, localStorage and CSS3.

Sencha Touch allows you to develop web apps that look and feel native on Apple iOS and Google Android touchscreen devices. It comes with many built-in UI Layout components including carousels, lists and tabs.

This HTML5 mobile application development framework supports custom events like:

• Tap
• Double tap
• Tap
• Hold & rotate, etc.

jQTouch is a free jQuery plugin for mobile web applications development. It lets you create powerful mobile web applications with just HTML, CSS, and jQuery for iPhone, iPod and other mobile platforms.

jQTouch comes with native animations, automatic navigation, and themes for mobile WebKit browsers like iPhone, G1, and Pre.

Functionality of this mobile web development jQuery plugin can be extended with extensions.

MoSync is an open source mobile software development kit helps users develop complex applications, then build and package your application for many mobile platforms and mobile devices in a few clicks.

MoSync offers fully featured IDE, best mobile development tools and utilities with extensive documentation. It has many built-in libraries including:

• User interface & Multimedia
• Bluetooth / HTTP / SMS
• Map rendering

With this cross platform mobile software development kit, you can develop applications for all major  mobile platforms and the list is getting bigger.