MailtoUI.js - Enhance your mailto links with a convenient user interface.
Missive - Team communication app now supporting FB, Twitter & SMS
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.
Mailtrim - Email lives forever!. Reinvigorate your emailing experience with the best free email client, the Mailtrim
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.