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