Yes, both Salesforce Service Cloud and Halo Service Desk offer a Free Trial.
Salesforce Service Cloud is designed for Large Enterprises, Medium Business and Small Business.
Halo Service Desk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Salesforce Service Cloud Starts at $25/user/month when yearly whereas for Halo Service Desk Starts at $40/User/Month.
Some top alternatives to Salesforce Service Cloud includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, HubSpot Service Hub, Help Scout, UseDesk, LabiDesk, AzureDesk, HESK and BoldDesk.
Some top alternatives to Halo Service Desk includes Freshservice, ManageEngine ServiceDesk Plus, Jira Service Desk, Symantec ServiceDesk, InvGate Service Desk, HelpDesk, TOPdesk, ReadyDesk, UseDesk, Milldesk, Sitehelpdesk and BoldDesk.