Yes, both Slack and Nectar HR offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Nectar HR is designed for Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Nectar HR Starts at $1/User/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 Nectar HR includes Deel, Synergita, Cooleaf, WorkTango, Benefit One, Employee Success Platform, EngageWith, Bonusly, Kudos, Let's Buzzz, Appreiz, Achievers, Workstars, HappyPerks, Nomify, Vantage Circle, Motivosity, Guusto, Bucketlist, Awardco and Leapsome.