Yes, both nandbox and GitHub offer a Free Trial.
nandbox is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for nandbox Starts at $49/Month whereas for GitHub Starts at $4/User/Month.
Some top alternatives to nandbox includes Nwicode, Bizness Apps, GitHub, Apphive, AppInstitute, Native, AppMaster.io and Codeless.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.