Task manager app comparable to Bionic app

[rich6661]

On my previous phone, a Bionic there was a great stock app called task manager. It did a great job at shutting down app that were not needed.
Is there a really good comparable app available?
Why does Verizon or Motorola axe the good ones and force the bloated unneeded ones?

 

[carracerz14]

Because task killers are not needed and usually do more harm than good