Yes, both Trello and Userback offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Userback is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for Trello Starts at $5/User/Month when Billed Yearly whereas for Userback Starts at $14/Month when Billed Yearly.
Some top alternatives to Trello includes Smartsheet, Miro, Process Street, Wrike, Notion, Freshbooks, Jira, Basecamp, Zoho Projects, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, ClickUp, Resource Guru and Height.
Some top alternatives to Userback includes Backlogs, Backlog, ReportBugz, Buglog, Usersnap, Ybug, Bug-Track.com, Disbug, Feedback Monkey and Toybox.