If you want to be included in PocketShut beta test before it is official released, just join our community:
https://plus.google.com/u/0/communities/114251225240961092535
(We will upload the demo to play store but only community members can be invited to this test in developer console. Welcome...
You know what? The long awaited widget is finally available in ShutApp now (version 1.11)!
You can know exactly and instantly about the number of background apps from your homescreen and stop them in one tap.
Meanwhile, enjoy the 100% improved shutting animation...
I think you can try ShutApp.
Here is a post about ShutApp on Android Central:
http://forums.androidcentral.com/android-app-inventor/433059-app-free-no-root-much-longer-battery-life-app-hypnotist.html#post4029982
And you can download it from...