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Zeek vs Malcolm: catalog facts
Zeek	Malcolm
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free to use; the source is published on GitHub by CISA.
macOS, Linux	Linux, Self-hosted
Protocol analysers produce semantic logs of what happened on the network rather than raw packets, and its scripting…	Brings PCAP, Zeek and Suricata data together in one searchable interface Deployable with Docker, Kubernetes or an installable ISO
It produces a large volume of logs that need somewhere to go, and writing custom detections means learning…	A large multi-container stack that needs substantial server resources Aimed at trained analysts rather than casual home users
Downloadable app	Self-hosted
Open source	Open source
License: BSD-3-Clause	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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