Yes, both Trello and GitHub offer a Free Trial.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Trello Starts at $5/User/Month when Billed Yearly whereas for GitHub Starts at $4/User/Month.
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 GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.