Yes, both Zendesk Support and CloudApp offer a Free Trial.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
CloudApp is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Zendesk Support Starts at $19/user/month when yearly whereas for CloudApp Starts at $8/User/Month.
Some top alternatives to Zendesk Support includes Zoho Desk, ManageEngine ServiceDesk Plus, Deskero, Support Hub, HelpDesk, Desky, Help Scout, Salesforce Service Cloud, ReadyDesk, Sitehelpdesk, HESK and BoldDesk.
Some top alternatives to CloudApp includes Scribe, FireShot, Snapup, RecordScreen.io, Snagit, Droplr, Jumpshare, Screenrec and Snippyly.