Mia - Virtual assistant for meetings
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Navigator - The Teamwork assistant — run great meetings without busywork
TextBlast Bulk SMS - Send personalized mass messages easily
Worklife Slackbot - Your personal meeting assistant, in Slack
Texted.io - Send text blasts to groups, receive individual replies