Yes, both Snappy and Campaign Monitor offer a Free Trial.
Snappy is designed for Large Enterprises, Medium Business and Small Business.
Campaign Monitor is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Snappy begins at $15/User/Month, while pricing details for Campaign Monitor are unavailable.
Some top alternatives to Snappy includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Deskero, Teamwork Desk, HelpDesk, SysAid, Jitbit Helpdesk, lemtalk, Spiceworks Help Desk, LabiDesk, HESK, Support.cc by 500apps and BoldDesk.
Some top alternatives to Campaign Monitor includes Campaigner, Moosend and SMTP.