osTicket - Manage, organize and archive all your support requests and responses in one place. GPL-2.0 PHP
Zammad - Easy to use but powerful open-source support and ticketing system. AGPL-3.0 Ruby/deb
MantisBT - Self hosted bug tracker, fits best for software development. GPL-2.0 PHP
FreeScout - Open source clone of Help Scout: email-based customer support application, help desk and shared mailbox. AGPL-3.0 PHP/Docker
Iguana - Iguana is an open source issue management system with a kanban board. CC-BY-SA-4.0 Python/Docker
Bugzilla - General-purpose bugtracker and testing tool originally developed and used by the Mozilla project. MPL-2.0 Perl
Request Tracker - An enterprise-grade issue tracking system. GPL-2.0 Perl
OTOBO - Flexible web-based ticketing system used for Customer Service, Help Desk, IT Service Management. GPL-3.0 Perl/Docker
GlitchTip - Open source error-tracking app. GlitchTip collects errors reported by your app. MIT Python/Docker/K8S
Erxes - Marketing, sales, and customer service platform designed to help businesses attract more engaged customers. GPL-3.0 Docker
ITFlow - Client IT Documentation, Ticketing, Invoicing and Accounting Web Application for MSPs (Managed Service Providers). GPL-3.0 PHP
Roundup Issue Tracker - A 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. MIT/ZPL-2.0 Python/Docker
Trudesk - Trudesk is an open-source help desk/ticketing solution. Apache-2.0 Nodejs/Docker
Approximately, we add new tools within three months.
We will publish it with a no-follow link.
However, you can publish your tool immediately and get a forever do-follow link.
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See you soon.