Mautic - Mautic is marketing automation software (email, social, & more).
CiviCRM - A Constituent relationship management for the Civic Sector
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Odoo CRM - Open Source CRM
amoCRM - amoCRM is the world’s first messaging-powered CRM.
Salesforce - CRM software solutions and enterprise cloud computing from salesforce.com, the leader in CRM and platform as a service.