Yes, both SeamlessDesk and HelpDesk offer a Free Trial.
SeamlessDesk is designed for Medium Business and Small Business.
HelpDesk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for SeamlessDesk Starts at $57/Month whereas for HelpDesk Starts at $29/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 HelpDesk includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, SupportBee, Teamwork Desk, SysAid, Jitbit Helpdesk, Snappy, Helpspot, ReadyDesk, HelpdeskEddy, Help Desk Premier, Support.cc by 500apps and BoldDesk.