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Zammad vs osTicket: catalog facts
Zammad	osTicket
Free The self-hosted community edition is free; hosted plans are sold separately.	Free Free to download and self-host; a separate paid hosted version is offered.
Linux, Web, Self-hosted	Web, Self-hosted
Packages for Debian, Ubuntu and CentOS plus Docker Actively released	Mature and widely used Self-hosted, keeping ticket data in house
Server runs on Linux only Heavier to set up than simple PHP help desks	You install, update and secure the server yourself Website promotes a separate paid hosted product
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.