The best open source alternative to Google Workspace is CryptPad. If that doesn't suit you, our users have ranked more than 50 alternatives to Google Workspace and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Workspace are Nextcloud Hub, eigen, Kolab and Kolab Now.
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.
France
EU
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
GermanyEU
Your own workspace. A self-hosted, open source alternative to Google Workspace: mail, drive, docs, sheets, slides, calendar and chat.
NetherlandsEU
Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
Switzerland
WikiSuite™ is especially suited to knowledge-centric organizations and offers most (80%+) of the data and information management features all organizations need.
Office suite that works locally in your web browser. You don't need to create account, everything remains on your device, nothing is sennt to the cloud.
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
Safebucket is an open-source secure file sharing platform designed to share files in an easy and secure way, integrating with different cloud providers. Built for individuals and organizations that need to collaborate on files with robust security, flexible access controls, and...
Canada
