Autistici / Inventati provides activists, groups and collectives with platforms for a freer communication and digital tools for privacy self-defence.

Hushmail is an encrypted proprietary web-based email service offering PGP-encrypted e-mail and vanity domain service.

Mailfence is a web-based email service that offers OpenPGP based end-to-end encryption and digital signatures.

RainLoop Webmail is a simple, modern & fast web-based email client.

SOGo (Scalable OpenGroupware.org) is an open source collaborative software (groupware) server with a focus on simplicity and scalability.

Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.

Horde is a free web-based groupware. The components of this groupware rest on the Horde framework. This PHP-based framework provides all the elements required…

Kolab Now is a web-based email and groupware service, based completely on free and open-source software.

Posteo is an email service provider offering paid email accounts for individuals and businesses.

Roundcube is a web-based IMAP email client. Roundcube's most prominent feature is the pervasive use of Ajax technology.

SquirrelMail provides both a web-based email client and a proxy server for the IMAP protocol.

Webmail Lite is an open-source webmail frontend.