Wrike
Freemium
Wrike is an online project management software that gives you full visibility and control over tasks.
Open Atrium
Open Source
Drupal is a free and open source content-management framework written in PHP and distributed under the GNU General Public License.
Mavenlink
Commercial
Mavenlink is an advanced project management, task collaboration, resource allocation, work management and professional services automation platform.
Microsoft Exchange Server
Commercial
Microsoft Exchange Server is a mail server and calendaring server.
Hive.com
Commercial
Hive.com is a productivity platform with powerful project management features.
Mailpile
Open Source
Mailpile is a webmail client with encryption and privacy features built-in. Mailpile is free and open-source software.
Baïkal
Open Source
Baïkal is a Cal and CardDAV server, based on sabre/dav, that includes an administrative interface for easy management.
dapulse
Commercial
Dapulse is a smart collaboration and communication app you can use to get your team members working in sync in one place.
taskblitz
Freemium
taskblitz is set of tools to collaboratively get your work done including project management, chat, time tracking and invoicing.
Compare SOGo with alternatives
Compare Microsoft Exchange Server and SOGo and decide which is most suitable for you.