Yes, both osTicket and Tidio Helpdesk offer a Free Trial.
osTicket is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Tidio Helpdesk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for osTicket Starts at $9/User/Month whereas for Tidio Helpdesk Starts at $24/month when yearly.
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 Tidio Helpdesk includes Zendesk Support and Zoho Desk.