Top Alternatives to SOGo

Wrike is an online project management software that gives you full visibility and control over tasks.

Roundcube is a web-based IMAP email client. Roundcube's most prominent feature is the pervasive use of Ajax technology.

Mailpile is a webmail client with encryption and privacy features built-in. Mailpile is free and open-source software.

Drupal is a free and open source content-management framework written in PHP and distributed under the GNU General Public License.

Teamwork Projects is a project management app.

5pm is a Web-based project and task management software.

Clockingit is a project management, collaboration and time tracking tool.

LibrePlan is a free software web application for project management.

RainLoop Webmail is a simple, modern & fast web-based email client.

Baïkal is a Cal and CardDAV server, based on sabre/dav, that includes an administrative interface for easy management.

SquirrelMail provides both a web-based email client and a proxy server for the IMAP protocol.

Horde is a free web-based groupware. The components of this groupware rest on the Horde framework. This PHP-based framework provides all the elements required for rapid web application development.

GQueues is a full-featured online task manager perfect for Google-powered individuals and businesses.

Smartsheet is a software as a service (SaaS) application for collaboration and work management.

Mavenlink is an advanced project management, task collaboration, resource allocation, work management and professional services automation platform.

Dapulse is a smart collaboration and communication app you can use to get your team members working in sync in one place.

Microsoft Exchange Server is a mail server and calendaring server.

Collabtive is a web-based project management software.

Stackfield provides end-to-end encrypted communication and collaboration with tasks, documents and projects for business teams.

SprintGround is a free task management for small software development teams and freelancers.

taskblitz is set of tools to collaboratively get your work done including project management, chat, time tracking and invoicing.

OX Open-Xchange is a web-based communication, collaboration and office productivity software.

Hive.com is a productivity platform with powerful project management features.