Yes, both Trello and Rollbar offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Rollbar is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Trello begins at $5/User/Month when Billed Yearly, while pricing details for Rollbar are unavailable.
Some top alternatives to Trello includes Basecamp, Wrike, Smartsheet, Zoho Projects, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard and Height.
Some top alternatives to Rollbar includes Sentry, Bugsnag, Zoho BugTracker, ReportBugz, BugHost, Bug-Track.com, Disbug and Crash Catch.