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Try Greenify. It 'hibernates' apps and works best if you're rooted with Xposed installed. It's in the Play Store for free.
One thing to keep in mind is that there are few reasons with an Android device to actually stop an app from running. If an app is running in the background it isn't using any resources aside from RAM. Android automatically caches frequently used apps in RAM so that they are ready to be used again as soon as you go to click open the app again, which has 0 effect on battery life.
I am most curious about why exactly you want to kill apps.
When I ran Greenify, I found apps that were not STOP'd so I uninstalled. Sounds like you r running Greenify so, after running Greenify on your cell, do you still have apps still running? I find them listed in the Battery section of Settings.
Those battery numbers can be misleading. If an app has run since the last full charge, it will still be shown as having consumed power, even though you may have stopped, or even uninstalled it. Until you fully charge your battery, those stats will remain in the list. For an accurate picture of what's really running and using power, you'll need a utility like WatchDog.
And cpu usage on a misbehaving phone is usually caused by wakelocks from bad apps or services.Personally I think they should remove all these app killers from the market. Memory is not anything one should be concerned with as Android can do a much better job at handling it than any one individual can. As far as battery drain goes again an app killer is not what is needed. Battery drain is more of a connection issue than a memory issue. Constant use of the radio's will drain your battery. If you have downloaded apps that are continually contacting the mothership then these will kill your battery and the best way to solve that is to uninstall said app. Poorly written apps are memory hogs but again memory can be handled by Android much better than by an Individual. I'm concerned more with how much an app is using my CPU than I am my RAM. CPU usage is what slows the device down not a full memory bank.
bloatware is also a cause of battery drainage
I'd like an app that would stop an install in its tracks if you've fat fingered or made a mistake otherwise.