Yes, both GitHub and OverOps offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
OverOps is designed for Large Enterprises, Medium Business and Small Business.
The starting price of GitHub begins at $4/User/Month, while pricing details for OverOps 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 OverOps includes Static Object, Retrace, DeepSource, ReSharper, codebeat, Codacy, DeepScan, SoftaCheck, Codeac and VCodeSpy.