Open Source CRM

https://www.odoo.com/zh_CN/page/crm

https://www.vtiger.com/open-source-crm/

https://suitecrm.com/

https://oroinc.com/orocrm/

https://opensource.com/business/16/2/top-6-open-source-crm-tools-2016

https://sourceforge.net/directory/business-enterprise/enterprise/crm/os:windows/

https://www.odoo.com/zh_CN/page/crm

https://sourceforge.net/projects/opensourceerp/?source=directory

https://www.openz.de/（Java）