WhatsMany - Send personalised WhatsApp messages in bulk
Text Blaster - Send thousands of text messages with one tap on Android
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
TextBlast Bulk SMS - Send personalized mass messages easily
Promote Route - A Better WhatsApp™ Experience
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!