DM Pilot - The Easiest and Most Reliable Way to Send Automated DMs
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
Auto Message - Auto Message is a scheduling app that offers several features such as sending automated emails, automatically answering calls & sending SMS/text messages.
FollowUpThen - The simplest way to schedule an email reminder
Auto Reply for whats - Auto Reply for whats is a bot that automatically replies to received messages, and you can also use its features to build campaigns for customer support.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.