WhatsMany - Send personalised WhatsApp messages in bulk
Leinko - Leinko helps non-technical independent professionals start their online virtual service business for coaching, training, teaching, or consulting.
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Datelist.io - Datelist - Online booking system
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.