Smart Slack Reminders - Schedule follow-up questions to any message in Slack 💬
Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
RemindUs - Advanced reminders for Slack teams
Ripcord - A desktop chat client for Discord and Slack
PullReminders - Review and release pull requests faster with Slack reminders and metrics.
Ziggs - Smoothly Share Content Between Devices!