WebRunner, at version 0.5 now, is a stripped-down version of Firefox that allows you to run a single site at a time in its own process. The browser has a minimal user interface with no toolbars or navigation UI -- just a window with the bare minimum needed to use applications like Google Reader, Flickr, Web-based help desks, or any Webmail client.

Portable Ubuntu is a Free application Software for Windows, runs an entire Linux operating system
as a Windows application. It is superb, and it is portable application , so you can carry it on your thumb drive. You can run Linux applications on your Windows desktop, Portable Ubuntu is a stand-alone package.

"Mozilla's WebRunner is a single-serving version of Firefox that strips away all the bells and whistles. There's no Web surfing to be done with this lightweight tool. Menus, extensions, themes, toolbars and navigation have all been excised, like a sculptor cutting away excess marble..."

The Mozilla Foundation has released version 1.0 beta of its Prism software. Formerly called WebRunner, this program closes the gap between local applications and web applications.

"A new piece of software has come to my attention today, a Mozilla project called WebRunner that aims to provide an easy way to create site-specific browsers (SSBs). The project is basically an extension on the XULRunner software, which itself is standalone version of the XUL engine that underpins the big Mozilla projects (Firefox, Thunderbird, Sunbird, Seamonkey)..."

1-Maxthon Portable
Browser is very beautiful and free
2-Google Chrome Portable
3-FireFox 3 Portable

"After much fooling around, WebRunner 0.7 is ready to release. This release has some small changes and some big changes..."

These days, it only takes an increasingly-cheap USB thumb drive and a program like UNetbootin to create a portable Linux desktop you can run on any computer that can boot from a USB port.

PortableApps.com founder John T. Haller has announced that his site for portable applications has reached its 100 millionth download milestone. PortableApps.com allows users to easily install various popular open source applications to a USB flash drive or external hard drive. Once installed, the applications can run completely from the drive and be used on any Windows computer.