Yes, both Trello and Celoxis offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Celoxis is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Trello Starts at $5/User/Month when Billed Yearly whereas for Celoxis Starts at $25/month when yearly.
Some top alternatives to Trello includes Smartsheet, Miro, Process Street, Wrike, Notion, Freshbooks, Jira, Basecamp, Zoho Projects, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, ClickUp, Resource Guru and Height.
Some top alternatives to Celoxis includes Smartsheet, Miro, Process Street, Wrike, Notion, Jira, Basecamp, Microsoft PPM, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Quick Base, ClickUp, Resource Management by Smartsheet and Height.