We have done lot of 3rd party integrations with ZOHO. Some of them are mentioned below:-
1. We have also done integration of websites using ZOHO APIs. We fetched the information of web-forms on the websites and pulled the data of that form into the CRM using Curl.
2. We have also done SMS service provider integration with ZOHO. For this we used the APIs of SMS service providers and with the help of that we sent the messages to the customers.
3.I have also done WhatsApp integration using a 3rd party app. I used the extension in the ZOHO CRM for integrating them.