Yes, both Zendesk Support and HelpDesk offer a Free Trial.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
HelpDesk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Zendesk Support Starts at $19/user/month when yearly whereas for HelpDesk Starts at $29/User/Month when Billed Yearly.
Some top alternatives to Zendesk Support includes Tidio Helpdesk, Deskero, Support Hub, HelpDesk, Desky, Help Scout, Salesforce Service Cloud, ReadyDesk, Sitehelpdesk, HESK and BoldDesk.
Some top alternatives to HelpDesk includes Zendesk Support, Tidio Helpdesk, Freshservice, Freshdesk, Zoho Desk, SupportBee, Teamwork Desk, SysAid, Jitbit Helpdesk, Snappy, Helpspot, ReadyDesk, HelpdeskEddy, Help Desk Premier, Support.cc by 500apps and BoldDesk.