Roundcube is described as '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' and is a very popular webmail provider in the office & productivity category. There are more than 25 alternatives to Roundcube for a variety of platforms, including Self-Hosted, Web-based, Linux, PHP and Cloudron apps. The best Roundcube alternative is Rainloop, which is both free and Open Source. Other great apps like Roundcube are Mailpile, Horde, Kolab and SOGo.
A fully fledged, free email server solution, an open source project (GPL v2).
Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.
Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
Works on both no.
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.
High security web-based e-mail system which extends considerably the email system to much more than currently exists.
TrulyMail is an email client and a private messaging system, very feature rich (voice recording, script blocking, etc.).
United States