Process Hacker 2.30 is a powerful replacement for Windows' Task Manager, and serves to provide both information and a way to shut down unwanted processes. It is aimed at users who have a basic understanding of system processes, resource usage, and so on, and may be of little use to users who are unfamiliar with these concepts. Since it allows users to shut down processes that other applications rely on, using it without at least some idea of what's going on could lead to system crashes or unexpected behavior.
Process Hacker is free and actively supported. If you can't imagine why you'd want or need it, it's probably not for you. But if you regularly fire up Task Manager for any reason, replacing it with Process Hacker is pretty much a no-brainer.
Note: The Download button on the Product Information page will download the software to your system.