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fnmap vs NetPeek: catalog facts
fnmap	NetPeek
Free Free and open source under the GPL-2.0 or later licence.	Free Free and open source under the GPL 3.
Linux	Linux
Graphical interface for nmap scans Quick Scan option for common scans	Simple GNOME interface for network discovery Shows open ports on discovered devices
Intended for authorized testing of networks you own or may scan Little recent activity visible on the developer site	Linux only Far fewer options than a full scanner like Nmap
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0-or-later
No account needed	No account needed
Not stated if it works offline	Not stated if it 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.