Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Missive - Team communication app now supporting FB, Twitter & SMS
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Front - The platform for exceptional customer service at scale.
Tutanota - Get your encrypted mailbox for free.