Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative we ...

Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts ...

Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to ...

SquirrelMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP ...

hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, sch ...

Isotope mail client is a free open source webmail application built with a microservice architecture vision in mind. As of now ...

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface . It provides useful co ...

Self-hosted server for the ProtonMail client.

Simple, modern & fast web-based email client. Modest system requirements, decent performance, simple installation and upgr ...

A fully fledged, free email server solution, an open source project (GPL v2).

Use official binary packages from Linux/BSD dist ...

A simple, fast and secure self hosted feed and mail reader, password and bookmark manager.

mailcow is a mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for adm ...

Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who ne ...

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is ...

Take back control of your email with this easy-to-deploy mail server in a box. Mail-in-a-Box turns a fresh cloud computer int ...