Redmine

Redmine is an open-source alternative you host yourself, giving you full control over data and customization. It tracks issues and tasks across multiple projects with Gantt views, time estimates, and milestone tracking built in. The platform supports plugins and custom fields, so teams can wire it to their specific workflows rather than adapting to off-the-shelf constraints.

It suits software teams and technical organizations that want to own their infrastructure and have the expertise to maintain it. Development shops especially like that Redmine integrates with version control and handles complex issue relationships without vendor lock-in.