Yes, both GitHub and Quire offer a Free Trial.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Quire is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for GitHub Starts at $4/User/Month whereas for Quire Starts at $8/member/month when yearly.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.
Some top alternatives to Quire includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Trello, Wrike, TeamGantt, Asana, Teamwork, ProjectManager.com, Kanboard, Kanbanize, Quick Base, Zenkit Projects and Kanban Tool.