Yes, both Kayako and Deskero offer a Free Trial.
Kayako is designed for Large Enterprises, Medium Business and Small Business.
Deskero is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Deskero begins at $9/User/Month when Billed Yearly, while pricing details for Kayako are unavailable.
Some top alternatives to Kayako includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, ManageEngine ServiceDesk Plus, Freshdesk, Deskero, Teamwork Desk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, CRMdesk, Sitehelpdesk, LabiDesk, HESK and BoldDesk.
Some top alternatives to Deskero includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Teamwork Desk, SeamlessDesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, ReadyDesk, Trakdesk, LabiDesk, DeskXpand and BoldDesk.