Top Alternatives to SOGo

Roundcube is a free and open-source webmail client providing a modern, user-friendly interface to access and manage your email via IMAP. It is designed for easy self-hosting and offers extensive customization options.

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.

Teamwork Projects is a comprehensive project management platform designed to streamline team collaboration, task management, and time tracking. It offers a robust suite of tools to plan, track, and deliver projects effectively, catering to teams of various sizes and industries looking for enhanced productivity and organization.

5pm is a web-based project and task management solution designed to streamline team collaboration, task organization, and workflow visualization. It helps teams manage projects of varying complexity through intuitive interfaces, real-time updates, and robust tracking capabilities.

ClockingIT was a comprehensive project management, collaboration, and time tracking tool designed for teams. It provided a centralized platform for managing tasks, tracking time, handling issues, and facilitating team communication, aiming to streamline project workflows before its discontinuation.

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.

RainLoop Webmail is a modern, fast, and user-friendly web-based email client designed for ease of use and robust functionality. It provides a clean interface for managing emails, supporting various protocols like IMAP and SMTP, and offers features like PGP encryption and multi-user support.

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.

SquirrelMail is a widely-used, open-source, web-based email client and IMAP proxy server. It provides a simple, functional interface for accessing email through a web browser, offering a cross-platform solution for email management.

Horde Groupware is a free, web-based suite of applications designed for collaboration and productivity. Built on the robust Horde framework, it offers a comprehensive set of tools including webmail, calendar, task management, and note-taking, providing an integrated platform for individuals and teams.

GQueues is a robust online task management solution explicitly designed for users within the Google ecosystem, offering seamless integration with Google Calendar, Gmail, and Google Drive to enhance productivity and collaboration for individuals and teams.

Smartsheet is a dynamic work management platform empowering teams to plan, track, and execute projects efficiently. It combines powerful features like project management, task management, collaboration tools, and automated workflows in a user-friendly, web-based interface.

Mavenlink is a comprehensive professional services automation and project management platform designed to streamline operations for service-based businesses. It unifies projects, resources, finances, and team collaboration into a single, intelligent system. Mavenlink empowers teams to deliver projects on time and budget while maximizing profitability and client satisfaction.

dapulse, now known as monday.com, is a powerful work operating system designed to manage projects, teams, and workflow efficiently. It provides a visual and intuitive platform to plan, track, and collaborate on various tasks and initiatives, bringing all team members and information into a centralized hub.

Microsoft Exchange Server is a robust mail and calendaring server designed for businesses of all sizes, providing enterprise-grade email, calendaring, and contact management capabilities.

Collabtive is a free and open-source web-based project management application designed for small to medium-sized businesses and teams. It offers a comprehensive suite of tools for task management, time tracking, document sharing, and team collaboration, making it a flexible and cost-effective solution for managing projects.

SprintGround is a free task management platform tailored for small software development teams and freelancers. It offers a robust set of tools to streamline project planning, task tracking, and team collaboration.

Stackfield is a comprehensive team collaboration platform designed for businesses requiring high levels of security. It integrates project management, task tracking, document sharing, group chat, and file management, all protected by end-to-end encryption. This ensures sensitive business data remains confidential and secure while enabling seamless team productivity.

taskblitz is a comprehensive suite of tools designed for collaborative work management, integrating project management, time tracking, invoicing, and communication into a single platform for teams and businesses.

Hive is a comprehensive productivity platform designed for modern teams, offering a suite of powerful project management, collaboration, and automation tools. It helps teams streamline workflows, manage tasks, track time, and communicate effectively, all within a centralized workspace. Hive aims to increase productivity and transparency across organizations of all sizes.

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.