WhatsMany - Send personalised WhatsApp messages in bulk
Task7 - The easiest way to manage and follow your tasks
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
BoostWork - Create tasks, schedule texts & send appointment reminders.
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!
Text Blaster - Send thousands of text messages with one tap on Android