Open-source alternatives to Salesforce

2 open-source and self-hostable projects you can use instead of Salesforce, with license, free-edition limits and setup checked against official sources.

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EspoCRMAlternative to Salesforce, HubSpot
A self-hosted CRM for managing leads, contacts, sales opportunities, marketing campaigns and support cases, with a PHP REST backend and a single-page web frontend.
AGPL-3.0Self-hostedCloud
3.5k
GitHub stars
Some features paywalled
SuiteCRMAlternative to Salesforce
An open-source CRM for sales, marketing and customer service that you host on your own PHP and MySQL-compatible stack, maintained as two lines: SuiteCRM 7 and SuiteCRM 8.
AGPL-3.0Self-hostedCloud
286
GitHub stars
Not yet assessed

EspoCRM — EspoCRM is an open-source CRM you can run on your own server, so it can replace a per-seat hosted CRM such as Salesforce for small and mid-size teams.
SuiteCRM — SuiteCRM is an AGPL-licensed CRM you can host yourself, so it can replace a per-seat hosted CRM such as Salesforce.