HEY - Email at its best, new from Basecamp.

ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.

Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.

Riseup - Riseup provides online communication tools for people and groups working on liberatory social change. We are a project to create democratic alternatives and practice self-determination by controlling our own secure means of communications.

Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.

GPGMail - GPGMail is an open source plugin for Apple Mail.