Yes, both Backlog and TeamGantt offer a Free Trial.
Backlog is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
TeamGantt is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Backlog Starts at $29.16/Month when Billed Yearly whereas for TeamGantt Starts at $19/Month when Billed Yearly.
Some top alternatives to Backlog includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Jira, Wrike, TeamGantt, FogBugz, Teamwork, ProjectManager.com, Trackboard, TaskBranch, Quick Base, TestRail, Height and Project Insight.
Some top alternatives to TeamGantt includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Wrike, ManagePro, monday.com, Teamwork, ProjectManager.com, Microsoft Project, GanttPRO, Instagantt, ProWorkflow, Quick Base, GoodGantt and Gantt.io.