Yes, both GitHub and A2Zapps offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
A2Zapps is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for GitHub Starts at $4/User/Month whereas for A2Zapps Starts at $1/Month.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.
Some top alternatives to A2Zapps includes AppElixir, Nwicode, GitHub, Apphive, Native, 2OS App Builder, AppMaster.io and Codeless.