Yes, both Campaign Monitor and Userback offer a Free Trial.
Campaign Monitor is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Userback is designed for Individuals, Freelancers, Medium Business and Small Business.
The starting price of Userback begins at $14/Month when Billed Yearly, while pricing details for Campaign Monitor are unavailable.
Some top alternatives to Campaign Monitor includes Campaigner, Moosend and SMTP.
Some top alternatives to Userback includes Backlogs, Backlog, ReportBugz, Buglog, Usersnap, Ybug, Bug-Track.com, Disbug, Feedback Monkey and Toybox.