Yes, both Slack and Atomatest offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Atomatest is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Atomatest Starts at $1,999/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 Atomatest includes VWO Testing, Act-On, Webmecanik Automation, Optimizely, AB Tasty, Convertize, ChangeAgain, Dual Kind, ABTesting.ai, UseItBetter and Increab.