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GKrellM vs CoreX: catalog facts
GKrellM	CoreX
Free Free and open source.	Free Free and open source under the MIT licence.
Linux	Linux
Many monitors in one compact window Sensor readings with alarms	Always-on-top draggable widget with live metrics HWiNFO-style sensor tree with real sensor names
Sensor support depends on kernel and hardware Old-fashioned look compared with modern widgets	Linux only Small project with a single maintainer
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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