Zammad
Easy to use but powerful open-source support and ticketing system.
FreeScout
Email-based customer support application, help desk and shared mailbox (alternative to Zendesk and Help Sco…
Erxes
Marketing, sales, and customer service platform designed to help businesses attract more engaged customers.
Frappe Helpdesk
Helpdesk software which helps you streamline your company's support, offers an easy setup, clean user inter…
Libredesk
Modern omnichannel customer support desk.
MantisBT
Bug tracker, fits best for software development.
Request Tracker
Enterprise-grade issue tracking system.
ITFlow
Client IT documentation, ticketing, invoicing and accounting for MSPs (Managed Service Providers).
Bugzilla
General-purpose bugtracker and testing tool originally developed and used by the Mozilla project.
OTOBO
Flexible web-based ticketing system used for customer service, help desk, IT service management.
GlitchTip
Error tracking app to collect errors reported by your app.
Forgejo
A lightweight software forge focused on scaling, federation, and privacy (fork of Gitea).
Roundup Issue Tracker
Simple-to-use and -install issue tracking system with command-line, web, REST, XML-RPC, and e-mail interfaces.