Open Source Communication - Email - Webmail Clients Software

Found 4 self-hosted alternatives in this category.

LGPL-2.1

Cypht

Feed reader for your email accounts

Website Source

GPL-3.0

Roundcube

Browser-based IMAP client with an application-like user interface

Website Source

AGPL-3.0

SnappyMail

Simple, modern, lightweight & fast web-based email client (fork of RainLoop). ([Demo](https://snappymail.eu/demo/), [Source Code](https://github.com/the-djmaze/snappymail), [Clients](https://snappymail.eu/repository/v2/plugins/))

Website Source

GPL-2.0

SquirrelMail

Another browser-based IMAP client

Website Source