Yes, both DoneDone and Backlog offer a Free Trial.
DoneDone is designed for Large Enterprises, Medium Business and Small Business.
Backlog is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for DoneDone Starts at $4/User/Month when Billed Yearly whereas for Backlog Starts at $29.16/Month when Billed Yearly.
Some top alternatives to DoneDone includes Backlog, TestRail, Bug-Track.com, Disbug and Crash Catch.
Some top alternatives to Backlog includes Wrike, Smartsheet, TeamGantt, Teamwork, ProjectManager.com, Trackboard, TaskBranch, TestRail, Height and Project Insight.