LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
MailtoUI.js - Enhance your mailto links with a convenient user interface.
IG MASS DMS - Seamlessly reach any target audience by using our mass dm software.
Mailjoy - Delightfully easy direct mail marketing. A DIY direct mail tool created for marketing and growth teams. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven mail campaigns.
Postscript - Like Mailchimp for SMS
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.