Yes, both osTicket and eStreamDesk offer a Free Trial.
osTicket is designed for Individuals, Large Enterprises, Medium Business and Small Business.
eStreamDesk is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for osTicket Starts at $9/User/Month whereas for eStreamDesk Starts at $29/Month.
Some top alternatives to osTicket includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Jira Service Desk, Freshdesk, HelpDesk, SysAid, UVdesk, Jitbit Helpdesk, eStreamDesk, ReadyDesk, Spiceworks Help Desk, HESK, BoldDesk and GLPI.
Some top alternatives to eStreamDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Deskero, Teamwork Desk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, Rhino Support, ReadyDesk, HelpdeskEddy, Sitehelpdesk and HESK.