Yes, both Backlog and Smartsheet offer a Free Trial.
Backlog is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Smartsheet is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Backlog Starts at $29.16/Month when Billed Yearly whereas for Smartsheet Starts at $7/User/Month when Billed Yearly.
Some top alternatives to Backlog includes Wrike, Smartsheet, TeamGantt, Teamwork, ProjectManager.com, Trackboard, TaskBranch, TestRail, Height and Project Insight.
Some top alternatives to Smartsheet includes Microsoft PPM, Trello, TeamGantt, monday.com, Asana, Teamwork, ProjectManager.com and Microsoft Project.