FreeScout source
Email-based customer support application, help desk and shared mailbox (alternative to Zendesk and Help Scout).
10 self-hosted alternatives to MantisBT (2026)
Bug tracker, fits best for software development.
Bugzilla source
General-purpose bugtracker and testing tool originally developed and used by the Mozilla project.
Frappe Helpdesk source
Helpdesk software which helps you streamline your company's support, offers an easy setup, clean user interface, and automation tools to resolve customer queries efficiently.
GlitchTip source
Error tracking app to collect errors reported by your app.
ITFlow source
Client IT documentation, ticketing, invoicing and accounting for MSPs (Managed Service Providers).
Libredesk source
Modern omnichannel customer support desk. Live chat, email, and more in a single binary.
OTOBO source
Flexible web-based ticketing system used for customer service, help desk, IT service management.
Request Tracker source
Enterprise-grade issue tracking system.
Roundup Issue Tracker source
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.
Zammad source
Easy to use but powerful open-source support and ticketing system.