Yes, both Pivotal Tracker and Wrike offer a Free Trial.
Pivotal Tracker is designed for Large Enterprises, Medium Business and Small Business.
Wrike is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Pivotal Tracker Starts at $6.50/User/Month whereas for Wrike Starts at $9.80/User/Month.
Some top alternatives to Pivotal Tracker includes Wrike, Smartsheet, TeamGantt, Teamwork, ProjectManager.com, Microsoft Project, Backlog, Trackboard, Projectsly by 500apps, Height and Project Insight.
Some top alternatives to Wrike includes Basecamp, Trello, TeamGantt, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project and ProWorkflow.