openproject

OpenProject is an open source alternative to Jira and MS Project that handles both styles of project management in one tool: classic plans with Gantt charts, and agile boards and backlogs. Add time and cost tracking, wikis and meetings, and it's a whole suite. GPLv3, from a Berlin company.

The free Community edition is self-hosted only, through Docker Compose, Linux packages or Helm. No Rails expertise needed, but you own a PostgreSQL database and the upgrades. It's more generous than you'd expect: Gantt, time tracking, project templates, custom fields, two-factor auth and LDAP login are all free.

Paid tiers cost the same per user per month in the cloud or on your own servers: Basic $7.25 (€5.95), Professional $13.50 with a 25-user minimum, Premium $19.50 with 100. Basic adds the team planner and baseline comparisons; SSO starts at Professional. Twenty users on cloud Basic run about $145/mo against roughly $158 on Jira Standard, but self-hosted Basic has a 25-user, annual minimum, so a 20-person team pays for 25 (about $181/mo). Solo and small teams: Community. Teams that need SSO: Professional.

The catch: Jira is free for up to 10 users and has a far bigger integration catalog. OpenProject wins when your project data has to stay on your servers, not on price.