Yes, both Slack and Woopra offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Woopra is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Woopra Starts at $349/Month.
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 Woopra includes SimilarWeb Pro, Google Analytics, CustomerEngagePro, Visitor Analytics, UserSurge, GoAnalyze, UseItBetter, UserSplit, Socialoop, Aqvil Analytics and Analyzati.