Avochato - Text messaging for your business.
WhatsMany - Send personalised WhatsApp messages in bulk
Message Me - Website to create your contact business card
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
StackWhats - Add the WhatsApp Live Chat to your website
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!