Yes, both Trello and CardBoard offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
CardBoard is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Trello Starts at $5/User/Month when Billed Yearly whereas for CardBoard Starts at $8.50/User/Month when Billed Yearly.
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.
Some top alternatives to CardBoard includes Collaboard, Miro, FigJam, StoriesOnBoard, SmartDraw, Gliffy, DrakonHub, FlowMapp, diagrams.net, FeatureMap, Board and HackerDraw.