Yes, both Slack and Qwary offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Qwary is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Qwary 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 Qwary includes SmartSurvey, QuestionPro, Couchsurvey, SurveyBox, Typeform, Liveform, VideoAsk, Voiceform and VideoForm.