Horde is described as 'Enterprise-level free suite offers IMAP email, calendar, contacts, tasks, notes, file manager, wiki, syncing, multi-language support, and mobile access' and is a webmail provider in the office & productivity category. There are more than 25 alternatives to Horde for a variety of platforms, including Web-based, Self-Hosted, Linux, Android and iPhone apps. The best Horde alternative is Gmail, which is free. Other great apps like Horde are Zoho Mail, Roundcube, Mailpile and mailcow: dockerized.
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.
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 application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.
SquirrelMail 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 pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers.
Thexyz build the best tools around for email to make your life simple. Continually updating the product offerings to give customers the very best in email and domain technology.
Titan is the first business email suite that helps you build deeper, more meaningful relationships with your customers.
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 one. And it's also a news reader :).
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.
Microservice based webmail client built with ReactJS and Spring.
Minimalistic webmail client which currently has the main features of any other mail client (read mail, compose mail, organize mail folders...).
United States
Netherlands
EU
Germany
Canada
Spain
Similar scope of groupware functionality, including calendar, tasks, etc.