Compare software

Zammad vs Znuny: catalog facts
Zammad	Znuny
Free The self-hosted community edition is free; hosted plans are sold separately.	Free Free open-source software; professional services are offered separately.
Linux, Web, Self-hosted	Web, Self-hosted
Packages for Debian, Ubuntu and CentOS plus Docker Actively released	Direct continuation of OTRS Community Edition Long-term support branch alongside a feature branch
Server runs on Linux only Heavier to set up than simple PHP help desks	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.