Yes, both Deskero and SeamlessDesk offer a Free Trial.
Deskero is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
SeamlessDesk is designed for Medium Business and Small Business.
Pricing for Deskero Starts at $9/User/Month when Billed Yearly whereas for SeamlessDesk Starts at $57/Month.
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.
Some top alternatives to SeamlessDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Deskero, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, ReadyDesk, Sitehelpdesk, HESK, Help Desk Premier, DeskXpand and Scopedesk.