Open-source and self-hosted CRM
What this situation needs
Teams with data-residency requirements or in-house engineers often want a CRM they can host themselves. The products below are listed because their official sites describe them as open source and offer a self-hosted deployment; both also sell a hosted option.
Suitability scores follow a published rubric: 50 points for an open-source licence stated on the official site, 30 for a documented self-hosted install, and 20 for a hosted alternative from the same vendor.
Ranked for Open-source and self-hosted CRM
Suitability is an editorial score out of 100; facts on each row are verified- Rank 1

EspoCRM
Open-source CRM you can self-host for free, or run as a hosted cloud with per-user plans and user minimums.
Free plan, paid from $15/mo
Suitability 100 of 100. Open source, installable on Windows, macOS and Linux, with a vendor cloud.
Not yet scored - Rank 2No preview yet
Twenty
Open-source CRM with unlimited custom objects, free self-hosting and hosted per-user plans billed yearly.
Free plan, paid from $9/mo
Suitability 100 of 100. Open source, free self-hosting, hosted plans billed yearly.
Not yet scoredCompare with EspoCRM