Yes, both Zendesk Support and Runrun.it offer a Free Trial.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
Runrun.it is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Zendesk Support Starts at $19/user/month when yearly whereas for Runrun.it Starts at $8/User/Month when Billed Yearly.
Some top alternatives to Zendesk Support includes Zoho Desk, ManageEngine ServiceDesk Plus, Deskero, Support Hub, HelpDesk, Desky, Help Scout, Salesforce Service Cloud, ReadyDesk, Sitehelpdesk, HESK and BoldDesk.
Some top alternatives to Runrun.it includes Smartsheet, Miro, Process Street, Wrike, Notion, TeamGantt, Zoho Projects, Teamwork, ProjectManager.com, Microsoft Project, ProWorkflow, Workep, Worksuite, Projectworks, Quick Base, ClickUp and Height.