Yes, both Desku and Zoho Desk offer a Free Trial.
Desku is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Zoho Desk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Desku Starts at $19/User/Month when Billed Yearly whereas for Zoho Desk Starts at $14/User/Month when Billed Yearly.
Some top alternatives to Desku includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, MessageDesk, Freshdesk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, eStreamDesk, UseDesk, HelpdeskEddy, Desk360, BoldDesk and Alerty.
Some top alternatives to Zoho Desk includes Zendesk Support, ManageEngine ServiceDesk Plus, Jira Service Desk, HelpDesk, SysAid, Desky, ReadyDesk, Sitehelpdesk, Trakdesk, HESK and BoldDesk.