RemindUs - Advanced reminders for Slack teams
Slack Video Messaging by Standuply - Easily record and send video messages in Slack 📹
PullReminders - Review and release pull requests faster with Slack reminders and metrics.
Timy - Best way to send scheduled messages in Slack
Reminder - A better way to keep track of your reminders 📝
Please Remind Me - A simple way to create reminders for when you need it.