What are some alternatives?
When comparing Windows Task Manager and Process Explorer, you can also consider the following products
htop - htop - an interactive process viewer for Unix. This is htop, an interactive process viewer for Unix systems. It is a text-mode application (for console or X terminals) and requires ncurses. Latest release: htop 2.
SystemExplorer - Homepage of System Explorer. Freeware Tool for displaying and managing system internals
Process Monitor - Monitor file system, Registry, process, thread and DLL activity in real-time.
glances system monitoring - Glances is a cross-platform system monitoring tool written in Python. Written in Python, Glances will run on almost any plaftorm : GNU/Linux, FreeBSD, OS X and Windows.
Process Hacker - Process Hacker is a feature-packed tool for manipulating processes and services on your computer.
Process Lasso - Process Lasso is NOT yet another task manager.