Yes, both Slack and Desk360 offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Desk360 is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Desk360 Starts at $19/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 Desk360 includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Deskero, Teamwork Desk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, EngageBay Helpdesk System, Helprace, HelpdeskEddy, LabiDesk and BoldDesk.
