Top Open‑Source Bug Trackers with Custom Workflow Support

Ruby‑on‑Rails project management app with flexible issue tracking, custom fields, and workflow transitions configurable per role.

Lightweight, wiki‑integrated issue tracker; workflow can be extended via plugins such as TracWorkflow and custom ticket states.

PHP‑based bug tracker offering customizable status values, workflow thresholds, and a robust plugin ecosystem for advanced routing.

Long‑standing Mozilla bug tracker; custom fields, statuses, and workflow rules can be defined through extensions and admin settings.

Comprehensive suite with Maniphest for bugs; custom workflows built via Herald rules, custom fields, and project tags.

Feature‑rich tracker with drag‑and‑drop workflow editor, per‑project states, and automated actions via triggers.

Ticketing system (now Znuny) that supports complex service‑level workflows, automations, and custom ticket states.

Powerful Perl‑based ticket system; custom lifecycle states, transitions, and scrips allow fine‑grained workflow automation.

Integrated issue tracker with configurable issue boards, custom states via labels, and workflow automation through CI/CD pipelines.

Web‑based project management with a built‑in bug tracker; custom workflows defined through status schemas and role‑based permissions.

ALM platform offering trackers with customizable fields, state machines, and transition rules per project.

Modern ticket system with a visual workflow editor, SLA rules, and trigger‑based automations for bug handling.

Open‑source error monitoring; issue workflow can be customized with owners, status, and custom actions via integrations.

Simple PHP bug tracker; custom statuses and workflow transitions can be defined per project.

Integrated SCM with built‑in bug tracker; workflow is driven by custom ticket types and state transitions.

Self‑hosted Git service with issue tracking; custom labels and project boards enable flexible workflow definitions.

Lightweight Git service; issue tracker supports custom labels, milestones, and workflow automation via webhooks.

Source code management platform with an extensible issue tracker; custom fields and state machines can be added via plugins.

Forge software hosting platform; its ticket system allows custom fields, states, and workflow scripts.

Python‑based issue tracker; workflow is defined by a schema file where you can add states, transitions, and scripts.

Distributed, file‑based bug tracker; custom workflow is achieved through metadata tags and command‑line hooks.

Kanban board app with simple issue tracking; custom columns act as workflow stages and can be automated via plugins.

Agile project management tool; its issue tracker supports custom statuses, tags, and workflow rules via project settings.

Git platform written in Scala; includes an issue tracker where custom labels and milestones shape the workflow.

Git server with built‑in issue tracking; workflow customization through labels, milestones, and webhook‑driven actions.

Universal source‑code manager; its issue tracker can be extended with custom fields and state transitions via plugins.

ASP.NET bug tracker; offers configurable statuses, custom fields, and workflow rules per project.

Java‑based bug tracker focusing on customizable workflows through XML‑defined state machines.

Lightweight bug tracker built on top of Bugzilla; adds a visual workflow editor for status transitions.

PHP bug tracker with a modular architecture; custom workflows are defined via configurable status pipelines.

Community‑maintained fork of Phabricator; retains powerful workflow automation via Herald and custom fields.

While the core is proprietary, the free Community Edition is released under an open‑source license and offers extensive custom workflow scripting.