Zoho CRM is a web-based customer relationship management application that has a native integration in Freshdesk. This integration would allow you to fetch requester information from this tool which is available in the contact details as well as tickets detail page. 

Please navigate to Admin -> Support Operations -> Apps -> Get more apps -> choose to install Zoho CRM. 

The integration will ask for the Auth Token which can be taken from your Zoho CRM account. For more information, please navigate to this link to set this up.