Yes, both Slack and Responsly offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Responsly is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Responsly Starts at $49/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 Responsly includes Blue, Engagenow, EngageVisitor, EngageRocket, Employee Success Platform, Livingroom Analytics, OMBEA Response, Qwizdom, Experience.com and The Experience Manager.