Perfex CRM Integration Active Pieces

Perfex CRM is the best and most complete open source CRM.

Here is Perfex CRM:

https://www.perfexcrm.com/

And here is an example of API integration:

https://perfexcrm.themesic.com/apiguide/index.html

Here is an example of WebHook integration:

https://codecanyon.net/item/webhooks-module-for-perfex-crm/38350010