Alternatives to OpenProject

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

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Redmine
Self-hosted project management released under the GNU General Public License v2, with no licence fee.
Why it’s an alternative: The other self-hosted option here, lighter and with no paid ladder attached.
Differs on: Free, while OpenProject is free plan, paid from €5.95/mo.
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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 alternative with a free tier for ten users if self-hosting is not required.
Differs on: Free plan, paid from $7.91/mo, while OpenProject is free plan, paid from €5.95/mo.
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Wrike
Work management with a free tier for unlimited users and paid plans at US$10 and US$25 per user, sold in user bands.
Why it’s an alternative: Hosted resource planning without the 25-user minimum OpenProject's paid tiers carry.
Differs on: Free plan, paid from $10/mo, while OpenProject is free plan, paid from €5.95/mo.
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Redmine and Jira list OpenProject as an alternative in turn. Alternatives are editorial relations, never votes.