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LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
InTouchApp Firefox Extension - Save contacts & data from websites to your phone
WhatsMany - Send personalised WhatsApp messages in bulk
Mustbin - Everything in one place. Whenever you need it.
Promote Route - A Better WhatsApp™ Experience