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Missive - Team communication app now supporting FB, Twitter & SMS
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Mailtrim - Email lives forever!. Reinvigorate your emailing experience with the best free email client, the Mailtrim
ProtonMail Extension - Unofficial webextension for ProtonMail
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
DejaLu - Fast and Simple Email Client for Mac