Process Explorer
Find out what files, registry keys and other objects processes have open, which DLLs they have loaded, and more.
Alternatives to Process Explorer
Htop
Free
And here is my lightning talk at FOSDEM presenting the latest and upcoming features:
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Glances
Free
Glances is a cross-platform curses-based system monitoring tool written in Python.
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Activity Monitor
Free
MacOS Mojave brings new features inspired by its most powerful users, but designed for everyone to the Mac.
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Process Hacker
Free
A free, powerful, multi-purpose tool that helps you monitor system resources, debug software and detect malware.
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IPulse
Paid
Using its concise and appealing user interface, iPulse graphically displays the inner workings of macOS on you desktop, menu bar or Dock.
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