Yes, both GitHub and Trackabi offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Trackabi is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for GitHub Starts at $4/User/Month whereas for Trackabi Starts at $16/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 Trackabi includes Timesheets.com, TrackingTime, TimeTrack, Timebase, Time Track Bill, Timesheet, 123FormBuilder, Zynq, Tidycal, OfficeTimer and Open Time Clock.