Yes, both Slack and SupportBee offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
SupportBee is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for SupportBee Starts at $13/User/Month when Billed Yearly.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to SupportBee includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, Teamwork Desk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, Desky, CRMdesk, ReadyDesk, HelpdeskEddy, Max HelpDesk and BoldDesk.