Source: https://opensource.com/business/16/2/top-6-open-source-crm-tools-2016
| Name | Source Code | Language | Home Page |
|---|---|---|---|
| EspoCRM | github.com/espocrm/espocrm | PHP | http://www.espocrm.com |
| SuiteCRM | github.com/salesagility/SuiteCRM | PHP | https://suitecrm.com |
| Oro CRM | github.com/orocrm/crm | PHP | http://www.orocrm.com |
| CiviCRM | github.com/civicrm/civicrm-core | PHP | https://civicrm.org |
| Fat Free CRM | github.com/fatfreecrm/fat_free_crm | Ruby | http://www.fatfreecrm.com |
| Zurmo | bitbucket.org/zurmo/zurmo | PHP | http://zurmo.org |