Yes, both Plumm and SupportChamp offer a Free Trial.
Plumm is designed for Medium Business and Small Business.
SupportChamp is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Plumm Starts at $7/User/Month whereas for SupportChamp Starts at $29/Month.
Some top alternatives to Plumm includes LiveAgent, Enchant, SupportChamp, DeskMoz, Zoho SalesIQ, ChatFlow247, Little SaaS Communication, Qualified, Our Shared Inbox, Workvivo, Commons and Sociocs.
Some top alternatives to SupportChamp includes Dialog, mais.im, imBee, Infobip, OmniOMS Customer Communication Management Suite, Microsoft Kaizala, Bundeling, Messenger Communication Platform, Sociocs and Sitelip.