Yes, both Zendesk Support and Zoho Assist offer a Free Trial.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
Zoho Assist is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Zendesk Support Starts at $19/user/month when yearly whereas for Zoho Assist Starts at $10/User/Month when Billed Yearly.
Some top alternatives to Zendesk Support includes Zoho Desk, Tidio Helpdesk, Deskero, Support Hub, HelpDesk, Desky, Help Scout, Salesforce Service Cloud, ReadyDesk, Sitehelpdesk, HESK and BoldDesk.
Some top alternatives to Zoho Assist includes and undefined.