#ticketing

Zammad

Easy to use but powerful open-source support and ticketing system. ([Source Code](https://github.com/zammad/zammad)) `AGPL-3.0` `Ruby/deb`

Roundup Issue Tracker

Simple-to-use and -install issue tracking system with command-line, web, REST, XML-RPC, and e-mail interfaces. Designed with flexibility in mind - not just another bug tracker. ([Source Code](https://www.roundup-tracker.org/code.html)) `MIT/ZPL-2.0` `Python/Docker`

OTOBO

Flexible web-based ticketing system used for customer service, help desk, IT service management. ([Demo](https://otobo.io/en/service-management-plattform/otobo-demo/), [Source Code](https://github.com/RotherOSS/otobo)) `GPL-3.0` `Perl/Docker`

MantisBT

Bug tracker, fits best for software development. ([Demo](https://www.mantisbt.org/bugs/my_view_page.php), [Source Code](https://github.com/mantisbt/mantisbt)) `GPL-2.0` `PHP`

Libredesk

Modern customer support desk. Single binary app. ([Source Code](https://github.com/abhinavxd/libredesk)) `AGPL-3.0` `Docker/Go/Nodejs`

Demo

Demo

ITFlow

Client IT documentation, ticketing, invoicing and accounting for MSPs (Managed Service Providers). ([Demo](https://demo.itflow.org), [Source Code](https://github.com/itflow-org/itflow)) `GPL-3.0` `PHP`

Demo

Demo

FreeScout

Email-based customer support application, help desk and shared mailbox (alternative to Zendesk and Help Scout). ([Demo](https://demo.freescout.net/login), [Source Code](https://github.com/freescout-help-desk/freescout)) `AGPL-3.0` `PHP/Docker`

Bugzilla

General-purpose bugtracker and testing tool originally developed and used by the Mozilla project. ([Source Code](https://github.com/bugzilla/bugzilla)) `MPL-2.0` `Perl`