Yes, both Campaign Monitor and Flow offer a Free Trial.
Campaign Monitor is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Flow is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Flow begins at $6/User/Month when Billed Yearly, while pricing details for Campaign Monitor are unavailable.
Some top alternatives to Campaign Monitor includes Pipedrive, Campaigner, Moosend and SMTP.
Some top alternatives to Flow includes Smartsheet, Miro, Process Street, Wrike, Notion, TeamGantt, Teamwork, ProjectManager.com, Microsoft Project, ProWorkflow, Trackboard, TaskBranch, Quick Base, ClickUp, Height, Task Flow and Project Insight.