Yes, both GitHub and Kantree offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Kantree is designed for Large Enterprises, Medium Business and Small Business.
The starting price of GitHub begins at $4/User/Month, while pricing details for Kantree are unavailable.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.
Some top alternatives to Kantree includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Jira, Trello, Wrike, TeamGantt, monday.com, Teamwork, Kanboard, Backlog, Quick Base, Collabee, Height and Kanban Tool.