Open Source Horde Alternatives
The best open source alternative to Horde is Roundcube. If that doesn't suit you, our users have ranked more than 25 alternatives to Horde and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Horde are Rainloop, mailcow: dockerized, Mailpile and Zimbra Collaboration Suite.
Horde alternatives are mainly WebMail Providers but may also be Email Clients or Mail Servers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Horde.Roundcube
Is this a good alternative?YesNo- Free • Open Source
- WebMail Provider
- Email Client
- Mail Server
29 alternatives to Roundcube- Self-Hosted
- PHP
- Cloudron
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 Features
Rainloop
Is this a good alternative?YesNo- Free • Open Source
- Email Client
- Mail Server
12 alternatives to Rainloop- Online
- Self-Hosted
- Nextcloud
- JavaScript
- PHP
- Cloudron
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.
Rainloop Features
mailcow: dockerized
Is this a good alternative?YesNo- Free • Open Source
- Mail Server
18 alternatives to mailcow: dockerized- Linux
- Self-Hosted
mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.
mailcow: dockerized Features
Mailpile
Is this a good alternative?YesNo- Free • Open Source
- Email Client
- WebMail Provider
59 alternatives to Mailpile- Linux
- Online
- Self-Hosted
- OpenPGP
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.
Mailpile Features
Discontinued1.0.0 Release Candidate 6 from 2019 is the last version on GitHub (https://github.com/mailpile/Mailpile/releases). Possibly the development has been stopped.
Zimbra Collaboration Suite
Is this a good alternative?YesNo- Freemium • Open Source
- Mail Server
- Calendar App
- Team Collaboration Tool
43 alternatives to Zimbra Collaboration Suite- Linux
- Online
- Self-Hosted
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.
Zimbra Collaboration Suite Features
Zimbra Collaboration Suite vs Horde
sondrakSimilar scope of groupware functionality, including calendar, tasks, etc.
SOGo
Is this a good alternative?YesNo- Freemium • Open Source
- WebMail Provider
64 alternatives to SOGo- Linux
- Online
- Thunderbird
- Cloudron
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 the use of standard protocols such as CalDAV, CardDAV and GroupDAV.Share your calendars, address books and mails in.
Squirrelmail
Is this a good alternative?YesNo- Free • Open Source
- WebMail Provider
17 alternatives to Squirrelmail- Self-Hosted
- PHP
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.
Squirrelmail Features
SnappyMail
Is this a good alternative?YesNo- Free • Open Source
- Email Client
12 alternatives to SnappyMail- Self-Hosted
- Web Browser
The drastically upgraded & secured fork of RainLoop Webmail Community edition.
SnappyMail Features
iRedMail
Is this a good alternative?YesNo- Freemium • Open Source
- Mail Server
69 alternatives to iRedMail- Linux
- BSD
- Self-Hosted
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.
Isotope Mail Client
Is this a good alternative?YesNo- Free • Open Source
- WebMail Provider
- Email Client
- Mail Server
11 alternatives to Isotope Mail Client- Mac
- Windows
- Linux
- Online
- Self-Hosted
- Kubernetes
- Docker
- OpenShift
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...).
Isotope Mail Client Features
Isotope Mail Client vs Horde