Yes, both SeamlessDesk and LiveAgent offer a Free Trial.
SeamlessDesk is designed for Medium Business and Small Business.
LiveAgent is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for SeamlessDesk Starts at $57/Month whereas for LiveAgent Starts at $15/User/Month.
Some top alternatives to SeamlessDesk includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, Deskero, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, ReadyDesk, Sitehelpdesk, HESK, Help Desk Premier, DeskXpand and Scopedesk.
Some top alternatives to LiveAgent includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, ClickDesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, Help Scout, LabiDesk, LiveChat, Zendesk Chat, LiveHelpNow and Little SaaS Communication.