Yes, both Slack and Calendoo offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Calendoo is designed for Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Calendoo Starts at $8.91/Month when Billed Yearly.
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 Calendoo includes Appointy, Calendly, SimplyBook.me, Cogsworth, Book Like A Boss, Scheduly, checkAppointments, ClickBook, DaySchedule, Appointmind, Web-appointments, CatchApp Bookings and Zoho Booking.
