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iTop vs Znuny: catalog facts
iTop	Znuny
Free Free and open source, with commercial offerings from Combodo.	Free Free open-source software; professional services are offered separately.
Web, Self-hosted	Web, Self-hosted
Combines ITSM ticketing with a CMDB Low-code customisation for different organisations	Direct continuation of OTRS Community Edition Long-term support branch alongside a feature branch
Setup and data modelling take effort Needs your own server to host	Self-hosting requires server setup and maintenance Aimed at organizations rather than individuals
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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