Adobe
Yes, both Backlog and Trello offer a Free Trial.
Backlog is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Backlog Starts at $29.16/Month when Billed Yearly whereas for Trello Starts at $5/User/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 Trello includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Freshbooks, Jira, Basecamp, Wrike, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, Resource Guru and Height.