Yes, both Slack and RemoteHQ offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
RemoteHQ is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for RemoteHQ Starts at $15/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 RemoteHQ includes Sodasync, WTEAM, Branch, Samesurf, CoLab, Plutoview, Remotings, Median CoBrowse, Collabtools, Qualified, Workvivo and Remo Virtual Office.