Unfortunately, due to changes in Android 5.0 (Lollipop), AppSwipe! is being retired. It will still function on devices running Android 4.4 and older, and you will still be able to download the app from the links below, but it will no longer be actively developed.
AppSwipe! is a task switcher and application manager for the Android platform. It is designed to have a similar look and feel as Alt+Tab or Command+Tab keyboard shortcuts on other popular operating systems, while providing a lot more functionality.
AppSwipe! lets you quickly switch between running applications, recently launched applications, running services and processes, and user-defined favorites with a single touch. You can also quickly free up memory, uninstall, and close running applications.