Yes, both Trello and Usersnap offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Usersnap is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Trello begins at $5/User/Month when Billed Yearly, while pricing details for Usersnap are unavailable.
Some top alternatives to Trello includes Basecamp, Wrike, Smartsheet, Zoho Projects, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard and Height.
Some top alternatives to Usersnap includes ReportBugz, Buglog, Ybug, Toybox and Userback.