Yes, both HelpDesk and Deskero offer a Free Trial.
HelpDesk is designed for Large Enterprises, Medium Business and Small Business.
Deskero is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for HelpDesk Starts at $29/User/Month when Billed Yearly whereas for Deskero Starts at $9/User/Month when Billed Yearly.
Some top alternatives to HelpDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, SupportBee, Teamwork Desk, SysAid, Jitbit Helpdesk, Snappy, Helpspot, ReadyDesk, HelpdeskEddy, Help Desk Premier, Support.cc by 500apps 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.