Software Tool : Alternate Task Manager Portable 
License : Free

We all are familiar with most basic but most important system feature of windows, i.e. task manager, here is portable task manager from alternate tools which can be used just by copying it to system desktop or local drives or in usb stick only. I personally keep this file in my software based usb drive always. Since I am related to computer service field, we need this a lot while giving service to our clients in their office or field. 

(link sends you to download page of author site)