Marketplace has many app that are web browsers. 4Browsers is an app that is designed to multitask 4 different web browsers in a single screen.
4Browsers is an app that is designed to emulate windows style multitasking on a Windows Phone device. It runs 4 independent web browsers on single screen. This app was designed and developed by Askpi Systems. The app can multi-task 2 different browsers at once. Each browser has its own storage to the homepage. If the user desires, he can maximize a single web browser to use only that and scroll the screen to access the rest of the browsers. In addition, this app features single browser view.
4Browsers app was available Android and IOS devices. The app was first released to Apple iPad in June, 2011. After 2 months releasing the iPad version, iPhone version was released. A month after that, version 2 of the app was released with many improvements. In January, 2012, the app was ported to Android tablets with Android 3.0 and above.
4Browsers for Windows Phone was released on February 17th, 2012. The app was developed during span two months. In the release for the Windows Phone, there is an extra feature that is not available in the previous release. It is the feature to multitask only 2 web browsers.
4Browsers is $0.99 without a free trial unfortunately and can be found in Marketplace here.