SOGo Alternatives for Linux

Mailpile is a free and open-source webmail client designed with privacy and encryption as core principles. It offers a self-hostable solution for managing your email with built-in support for PGP encryption and other security features, providing an alternative to traditional webmail services.

Open Atrium is a powerful open-source collaboration and project management platform built on Drupal. It provides a modular framework to create customized intranets, team sites, and project workspaces, facilitating communication, document sharing, task management, and more within organizations.

LibrePlan is a powerful, open-source web-based project management application designed to help organizations effectively plan, manage, and monitor projects. It offers robust features for task scheduling, resource allocation, collaboration, and reporting, all accessible through a standard web browser.

Baïkal is a lightweight and easy-to-use CalDAV and CardDAV server, providing a simple way to sync your calendars and contacts across various devices and applications. Built upon the robust sabre/dav library, it offers a straightforward administrative interface for seamless management of users and data.

OX Open-Xchange is a comprehensive web-based suite designed for communication, collaboration, and office productivity, offering features like email, calendaring, task management, and document sharing, seamlessly integrating across devices.