Yes, both Campaign Monitor and Kustomer offer a Free Trial.
Campaign Monitor is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Kustomer is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Kustomer begins at $29/User/Month, while pricing details for Campaign Monitor are unavailable.
Some top alternatives to Campaign Monitor includes Pipedrive, Campaigner, Close, Moosend and SMTP.
Some top alternatives to Kustomer includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Zendesk Sell, Freshservice, Freshdesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, Salesforce Service Cloud, CRMdesk, Gorgias, Trakdesk, AzureDesk and BoldDesk.