Yes, both Zendesk Explore and productboard offer a Free Trial.
Zendesk Explore is designed for Large Enterprises, Medium Business and Small Business.
productboard is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Zendesk Explore Starts at $49/User/Month whereas for productboard Starts at $20/User/Month when Billed Yearly.
Some top alternatives to Zendesk Explore includes Evidence, Databox, ManageEngine Analytics Plus, Metric.ai, Dundas BI, SAS Business Intelligence, SAP BusinessObjects BI, Panintelligence, ibi Analytics Platform and myDATA3.
Some top alternatives to productboard includes Aha!, Roadmunk, ProdPad, ProductPlan, Jira, Productroad, ProductFlare, Next Please, airfocus and IdeaPlan.