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below vs nmon: catalog facts
below	nmon
Free Free and open source.	Free Free to download.
Linux, Command line	Linux, Command line
Records data so past events can be replayed Shows the cgroup hierarchy alongside process details	Many metrics on one screen with low CPU impact Records to CSV for later analysis
Linux only Aimed at servers rather than casual desktop use	Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.