Yes, both Slack and Get Lighthouse offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Get Lighthouse is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Get Lighthouse Starts at $29/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 Get Lighthouse includes Lattice, 15Five, Synergita, Small Improvements, PerformYard, PeopleGoal, Chairlift, PerformanceHub, KMS Lighthouse, heylogin and Leapsome.