Redmine

Multi-project support with role-based access Run many projects in one installation with flexible per-project roles and permissions, which lets one instance serve separate teams, clients, or departments.[1]

Flexible issue tracking with custom fields Track issues with configurable statuses, custom fields for issues, projects, users, and time entries, plus issue creation via email and feeds with notifications.[1]

Gantt charts and calendars Plan phased work on Gantt views and follow deadlines on per-project calendars, which carry the classic scheduling workflow long-lived projects still plan against.[1]

Time tracking and reporting Log hours directly on issues and projects and roll them into reports, which gives service teams timesheets next to the tracker.[1]

Wikis, forums, news, and files Hold the delivery conversation next to the plan with per-project wikis, forums, news, document, and file management instead of a separate knowledge tool.[1]

SCM integration across five systems Link issues and browse repositories from Subversion, Git, Mercurial, Bazaar, and CVS, keeping code activity referenced from the work it serves.[1]

REST API in XML and JSON Create, read, update, and delete issues and core resources programmatically with authentication, pagination, and custom-field support for integrations.[1]

LDAP authentication and self-registration Admit members through multiple LDAP sources with optional self-registration and multilingual interface support for distributed organisations.[1]

Engineering and IT organisations standardising on self-hosted tracking Multi-project support, role-based access, and LDAP give centralised issue tracking on the organisation's own servers, which matters for teams with data-control requirements.[1][2]

Development teams wanting tracker-to-repository links Native SCM integration across five version-control systems keeps commits and issues connected without plugins, instead of a tracker that treats code as an afterthought.[1]

Cost-sensitive teams escaping per-seat fees A GPL-2.0 license with free download and no paid edition removes license spend for Gantt planning, wikis, and time logging, so budget-limited teams get the full loop for server cost alone.[1]

Teams with no servers and no ops appetite The documented route is an eleven-step manual installation with database setup that you operate and upgrade yourself, and there is no official managed cloud, so a team with neither infrastructure nor admins should pick a managed tracker instead.[1][2]

Fans of modern, polished onboarding A functional but dated interface and manual configuration add friction that a team expecting guided setup and contemporary UX will feel as overhead rather than control.[1]

Teams needing vendor support contracts There is no commercial vendor support offering on the official site, only community forums and wiki documentation, so organisations that require SLAs should look at commercially backed alternatives.[1][2]