Kippa - From inside Teams, Kippa reminds you or your team-members about events to keep the team running like clockwork.Kippa's five-minute learning curve enables you to quickly set personal and shared reminders, (@mentions), or to Private Channels.
RemindUs - Advanced reminders for Slack teams
Reminder - A better way to keep track of your reminders 📝
Slack - A messaging app for teams who see through the Earth!
doo - A smart, simple app for reminders and to-dos
Workplace by Facebook - Connect everyone in your company and turn ideas into action.