Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
WhatsMany - Send personalised WhatsApp messages in bulk
LazyGroup: Mass Text message - Group text
TextBlast Bulk SMS - Send personalized mass messages easily
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.