Yes, both Userback and DoneDone offer a Free Trial.
Userback is designed for Individuals, Freelancers, Medium Business and Small Business.
DoneDone is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Userback Starts at $14/Month when Billed Yearly whereas for DoneDone Starts at $4/User/Month when Billed Yearly.
Some top alternatives to Userback includes Backlogs, Backlog, ReportBugz, Buglog, Usersnap, Ybug, Bug-Track.com, Disbug, Feedback Monkey and Toybox.
Some top alternatives to DoneDone includes Backlog, Teamwork Desk, Issuetrak, HelpDesk, Snappy, TestRail, Bug-Track.com, Disbug, TaskSift and Crash Catch.