Yes, both Help Scout and Zendesk Talk offer a Free Trial.
Help Scout is designed for Large Enterprises, Medium Business and Small Business.
Zendesk Talk is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Help Scout Starts at $20/User/Month when Billed Yearly whereas for Zendesk Talk Starts at $9/User/Month.
Some top alternatives to Help Scout includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, Desky, eStreamDesk, CRMdesk, ReadyDesk, Trakdesk, LabiDesk and HESK.
Some top alternatives to Zendesk Talk includes Nextiva, TalkDesk, uContact, HoduCC, Call Center Studio, TelebuHub, Zendesk Support, VoxDesk, Zendesk Chat and Freshdesk Contact Center (Formerly Freshcaller).