Microsoft Office 365!

Office 365 is a subscription-based software services that licenses Microsoft Office products for on-premise or cloud-based use.

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Microsoft Office 365 alternatives


ONLYOFFICE Desktop Editors is an open-source office suite that combines text, spreadsheet and presentation editors, distributed under AGPL license ...

tags: business-collaboration calendar collaborative-spreadsheet corporate-wiki customer-relationship-manager
platform: Mac OS X Windows Linux Online Self-Hosted

G Suite

G Suite (formerly Google Apps for Work) is Google's encompassing selection of cloud apps for business, including customizable products under custom...

tags: anti-spam calendar cloud-computing cloud-desktop office-suite
platform: Mac OS X Windows Linux Online Chrome OS


Open365 is an Open Source, self-hosted file sync and cloud apps platform including a full LibreOffice Online. You can also access your email, calen...

tags: Discontinued cloud-sync email-client libreoffice office365
platform: Android Self-Hosted Discontinued

Kolab Community

Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it ...

tags: activesync caldav carddav groupware imap
platform: Linux Online Self-Hosted

Kolab Now

Kolab Now, formerly MyKolab, is a fully featured secure collaboration and communication service that is easy to use on any device.

tags: address-book caldav calendar carddav cloud-computing
platform: Online DAVdroid


With Samepage, you can put all your project information on one page and collaborate with your team in real time. Samepage brings together an entire...

tags: collaborative-writing content-creation content-templates file-sharing file-synchronization
platform: Mac OS X Windows Online

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application availab...

tags: calendar groupware mail-server
platform: Linux Online

Microsoft SharePoint

Microsoft Office SharePoint Server is an integrated suite of server capabilities that can help improve organizational effectiveness by providing co...

tags: cms document-management intranet outlook-sync
platform: Windows Online Android iPhone Windows Phone

MDaemon Messaging Server

MDaemon Messaging Server software for Windows can be deployed in virtual, hosted cloud or private on-premise environments. It is used by businesses...

tags: dropbox-integration email-encryption email-hosting encrypted-email group-chat
platform: Windows

Kerio Connect

Kerio Connect makes email, calendars, contacts and task management easy and affordable. With Kerio Connect, you have immediate, secure access to yo...

tags: antivirus backup-and-restore chat-servers contact-sync imap-transfers
platform: Mac OS X Windows Linux Online


Axigen is a premium, all-in-one email, calendaring and collaboration platform, based on an innovative, proprietary technology, providing unmatched ...

tags: api caldav calendaring carddav delegated-administration
platform: Mac OS X Windows Linux BSD Self-Hosted Microsoft Office Outlook


Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.

tags: archiving caldav cloud-hosting email-client email-management
platform: Mac OS X Windows Linux Online Android iPhone Android Tablet Windows Phone iPad Microsoft Office Outlook


OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.

tags: outlook exchange mail-server
platform: Linux

Atmail Email Server

Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.

tags: address-book business-email email-client email-sending exchange-calendar-sync
platform: Linux Online

SpinOffice CRM

SpinOffice is the only CRM software application that saves you time. Stay connected with your friends and business contacts and save time by gettin...

tags: calendar cloud-based contact-sync contacts customer-relationship-manager
platform: Mac OS X Windows Online