Yes, both GitHub and Cflow offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Cflow is designed for Large Enterprises, Medium Business and Small Business.
Pricing for GitHub Starts at $4/User/Month whereas for Cflow Starts at $7/User/Month when Billed Yearly.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.
Some top alternatives to Cflow includes NinjaOne (NinjaRMM), Flowfinity, Nintex, IBM Business Automation Workflow, ZapUp by 500apps, Yoroflow, WovVFlow, Workflow86, Built.io Flow and Quickflow.