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btop++Plasma System Monitor
Free

Free and open source, funded by donations.

 Free

Free and open source, developed by the KDE community.

macOS, Linux, Command line Linux
  • Sortable, filterable process list with per-process detail, driven by mouse or keyboard
  • Graphs for CPU, memory, disks and network in one screen
  • Shows sensors, processes and resource usage in one window
  • Customizable monitoring pages
  • No native Windows build; on Windows you need WSL
  • It reports and does not manage: there is no alerting or historical logging
  • Linux only
  • Most at home on a KDE Plasma desktop
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-2.0-only OR GPL-3.0-only
No account needed No account needed
Works offline Works offline

Checked September 20, 2026

Checked September 23, 2026

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