EspoCRM — #4 Alternative to Salesforce / HubSpot
Fast, lightweight self-hosted open-source CRM with BPM workflows and custom entities
Runs effortlessly on modest Linux servers with PHP + MySQL/MariaDB, delivering full entity customization, IMAP group email, VoIP, and REST APIs.
License: AGPL-3.0 · Pricing: Open Core · Compare all Salesforce / HubSpot alternatives · Official Website