LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Hum - Songwriting for iPhone
TextBlast Bulk SMS - Send personalized mass messages easily
Songcraft.io - A platform for songwriters to write, organize & collaborate.
Texted.io - Send text blasts to groups, receive individual replies
RiffShare - Write down a musical riff, send to band members, collaborate