Yes, both Mission-X and Trello offer a Free Trial.
Mission-X is designed for Large Enterprises, Medium Business and Small Business.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Mission-X Starts at $7.99 whereas for Trello Starts at $5/User/Month when Billed Yearly.
Some top alternatives to Mission-X includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Wrike, Teamwork, ProjectManager.com, Microsoft Project, ApuTime, VisionProject, Projectworks, Quick Base, Mission Control, 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.