send.appdoubler.comSoftware by SalesNexus
Postscript - Like Mailchimp for SMS
WhatsMany - Send personalised WhatsApp messages in bulk
Zoho CRM - Omnichannel CRM for Businesses of all sizes
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!