TasKiller let you close (kill) your running applications in one click. You can also switch between apps.Discontinued
The official website is no longer available. Last version, 4.0, released on November 2014, is still downloadable from Google Play Store.
Easy to use and extremely fast application manager.
Allows you to manage Applications and Widgets on your phone. Backup and restore apps. Very fast and flexible interface.
Features list: -launch -backup to SD -details -uninstall -search on market -all kinds of sorting -batch in.
This application enables you to: 1.list up currently running applications 2.switch to another application 3.stop one or all at once "Stop-Excluded" is supported to prevent specifed applications from being stopped. It can also stay in the status bar enabling quick access.