Yes, both Pivotal Tracker and CircleCI offer a Free Trial.
Pivotal Tracker is designed for Large Enterprises, Medium Business and Small Business.
CircleCI is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Pivotal Tracker Starts at $6.50/User/Month whereas for CircleCI Starts at $39/Month.
Some top alternatives to Pivotal Tracker includes Smartsheet, Miro, Process Street, Wrike, Notion, Jira, TeamGantt, Teamwork, ProjectManager.com, Microsoft Project, Backlog, Trackboard, Quick Base, ClickUp, Projectsly by 500apps, Height and Project Insight.
Some top alternatives to CircleCI includes Codeship, Semaphore, GitLab, Bamboo, AutoRABIT CI, Buildkite, CloudBees Core, Travis CI, AppVeyor and Bitbucket.