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