Yes, both GitHub and FogBugz offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
FogBugz is designed for Large Enterprises, Small Business and Medium Business.
The starting price of GitHub begins at $4/User/Month, while pricing details for FogBugz 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 FogBugz includes Freshbooks, Jira, Wrike, Smartsheet, Zoho Projects, GitScrum, Teamwork, ProjectManager.com, Backlog, Worksuite, Sprintly, Quick Base, ClickUp, Resource Guru, TestRail, Height, Yodiz and TaskBlast.