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osTicket vs Znuny: catalog facts
osTicket	Znuny
Free Free to download and self-host; a separate paid hosted version is offered.	Free Free open-source software; professional services are offered separately.
Web, Self-hosted	Web, Self-hosted
Mature and widely used Self-hosted, keeping ticket data in house	Direct continuation of OTRS Community Edition Long-term support branch alongside a feature branch
You install, update and secure the server yourself Website promotes a separate paid hosted product	Self-hosting requires server setup and maintenance Aimed at organizations rather than individuals
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is 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.