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Znuny vs ManageEngine ServiceDesk Plus: catalog facts
Znuny	ManageEngine ServiceDesk Plus
Free Free open-source software; professional services are offered separately.	Paid Commercial software with a free trial.
Web, Self-hosted	Web, Self-hosted
Direct continuation of OTRS Community Edition Long-term support branch alongside a feature branch	ITSM, asset management and CMDB in one product Available on-premises or in the cloud
Self-hosting requires server setup and maintenance Aimed at organizations rather than individuals	Commercial product aimed at organisations Broad feature set takes time to configure
Self-hosted	Self-hosted, Hosted service
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	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.