Squirrelmail!

Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking. Roundcube's most prominent feature is the pervasive use of Ajax technology.

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license.

Simple, modern & fast web-based email client. Modest system requirements, decent performance, simple installation and upgrade, no database required. All these make RainLoop Webmail a perfect choice for your email solution.

Soverin is an independent private company based in Amsterdam, run by a team of internet enthusiasts who want to create great products that are safe, beautiful and easy to use. We’re passionate about changing the status quo and actively want to raise awareness about digital privacy.

ZeroMail - End-to-end encrypted, peer-to-peer not-instant messaging site.

Open SourceWebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.NET or free web browser based email client software for Linux PHP, please download our software and use it at no cost for as long as you wish. You may also want to compare the WebMail Lite application features vs. WebMail Pro application by clicking the following link. »

Self-hosted server for the ProtonMail client.

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

NaSMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in HTML 4.01 with minimal JavaScript and CSS. It has very few requirements and is very easy to configure and install. NaSMail has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.

Cypht is an Open Source webmail application written in PHP and JavaScript that speaks native IMAP, POP3, and SMTP. This is a third generation E-mail client from the developers of the Hastymail project.

NeoMail is a web-based mail client that allows users to access their mail spools and send messages. It does not require a POP3 server, or any shell access for the users. It interfaces directly with user mail spools.

Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.

NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts.

Turing Email is an email client that you can use with your existing email accounts that is packed with innovative features packaged into a beautiful design. Turing is the premium email for sales professionals.