Alternatives to Squirrelmail for all platforms with any license

Roundcube

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...

Free Open Source Self-Hosted PHP Cloudron
Hostable PGP Encryption Add a feature

142 Like
Mailpile

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...

Free Open Source Mac Windows Linux Web Self-Hosted ... OpenPGP
Encrypted Email POP3 Support Web-Based Add a feature

109 Like
Rainloop

Simple, modern & fast web-based email client. Modest system requirements, decent performance, simple installation and upgrade, no database required. All these make...

Free Open Source Self-Hosted JavaScript PHP Cloudron
Encrypted Email Email Server Add a feature

46 Like
SOGo

SOGo is groupware server with a focus on scalability and open standards. SOGo provides a rich AJAX-based Web interface and supports multiple native clients through...

Free Open Source Linux Web Thunderbird Cloudron
CalDAV CardDAV Support for Multiple Users Scheduling Add a feature

28 Like
Horde

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

Free Open Source Web Self-Hosted
CalDAV Add a feature

24 Like
Webmail Lite

Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail...

Free Open Source Web Self-Hosted
No features added Add a feature

16 Like
NeutronMail

Self-hosted server for the ProtonMail client.
- Discontinued No longer supported
Free Open Source Web Self-Hosted
Apps with End-to-End Encryption Web-Based Add a feature

7 Like
Cypht

All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into...

Free Open Source Self-Hosted
Built-in RSS reader Apps with End-to-End Encryption Modules POP3 Support ... SMTP Add a feature

7 Like
CacoCloud

A simple, fast and secure PHP/AngularJS based single user feed and mail reader, password and bookmark manager. CacoCloud is divided into a RESTful PHP backend storing...
- Discontinued The project is no longer developed. Last version, 0.1.1, released in February 2015, can be still downloaded from the official website.
Free Open Source Self-Hosted AngularJS
News aggregator Web-Based Add a feature

9 Like
Turing Email

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...

Commercial Mac Windows Web Android iPhone ... Android Tablet iPad
Email scheduling Email tracking Salesforce integration Add a feature

3 Like
Isotope Mail Client

Microservice based webmail client built with ReactJS and Spring. Minimalistic webmail client which currently has the main features of any other mail client (read...

Free Open Source Mac Windows Linux Web Self-Hosted ... Kubernetes Docker OpenShift
Autocompletion Support for Docker Dockerized Drag n drop ... Email Server No database needed Rich text editing Web-Based Add a feature

1 Like
Atmail Email Server

Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows. Features: Webmail Calendar Addressbook ...

Commercial Linux Web
File-sync Group Mail Email Server Add a feature

7 Like
NOCC

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

Free Open Source Web
POP3 Support SMTP Add a feature

4 Like
NeoMail

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....

Free Open Source Web
No features added Add a feature

3 Like
phlyMail

phlyMail is an advanced webmail and groupware solution featuring unlimited profiles, multiple users, a calendar, contacts list and much more

Freemium Web
POP3 Support SMTP Themes Add a feature

2 Like