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pmacct vs SiLK: catalog facts
pmacct	SiLK
Free Free and open source.	Free Free under the GNU General Public License version 2.
Linux, Self-hosted, Command line	macOS, Linux, Command line
Supports NetFlow, IPFIX, sFlow and libpcap Collects BGP, BMP and RPKI routing data	Collects IPFIX and multiple NetFlow versions Stores flow records in compact files
Configured through text files with many keys Aimed at operators rather than home users	Designed for large network traffic datasets Requires a separate flow data collection setup
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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