Alternatives to Redmine

3 tools that cover the same need, each with the one difference that matters most.

OpenProject
Open-source project management with a free self-hosted community edition and paid editions from €5.95 per user a month.
Why it’s an alternative: A more complete self-hosted suite, with paid editions and support available.
Differs on: Free plan, paid from €5.95/mo, while Redmine is free.
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Jira
Issue tracker and planning tool, free for ten users and US$7.91 per user a month above that.
Why it’s an alternative: Hosted issue tracking with a free tier, if maintaining Ruby on Rails is not appealing.
Differs on: Free plan, paid from $7.91/mo, while Redmine is free.
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ClickUp
Broad work platform with a free forever plan and paid tiers at US$7 and US$12 per user a month.
Why it’s an alternative: Hosted platform with far more views, at a per-seat cost Redmine does not have.
Differs on: Free plan, paid from $7/mo, while Redmine is free.
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OpenProject lists Redmine as an alternative in turn. Alternatives are editorial relations, never votes.