Yes, both Slack and Google Calendar offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Google Calendar is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for Google Calendar are unavailable.
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 Google Calendar includes Appointy, Calendly, Cogsworth, Scedule, Book Like A Boss, Meetin.gs, Calendar.AI, EasyCalendar, Office Tracker, MeetingPlanner.io, DaySchedule, Fantastical Scheduling and Calendar.