WhatsMany - Send personalised WhatsApp messages in bulk
Hum - Songwriting for iPhone
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Songcraft.io - A platform for songwriters to write, organize & collaborate.
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!
RiffShare - Write down a musical riff, send to band members, collaborate