Yes, both Zingtree and Kustomer offer a Free Trial.
Zingtree is designed for Medium Business and Small Business.
Kustomer is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Zingtree Starts at $8/Month whereas for Kustomer Starts at $29/User/Month.
Some top alternatives to Zingtree includes Nextiva, Dialer360, Call Center Studio, TelebuHub, Truly, Aircall, Ozonetel CloudAgent, ice Contact Center, ipSCAPE and LeadDesk.
Some top alternatives to Kustomer includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Zendesk Sell, Freshservice, Freshdesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, Salesforce Service Cloud, CRMdesk, Gorgias, Trakdesk, AzureDesk and BoldDesk.