Sites and apps similar to Contactoffice include eigen, which is free and open source. Other options are Google Workspace, Icedrive, Nextcloud Hub and Infomaniak kSuite. You can choose from more than 10 Calendar Apps like Contactoffice for self-hosting, Linux, Android, iPhone and Windows.
Your own workspace. A self-hosted, open source alternative to Google Workspace: mail, drive, docs, sheets, slides, calendar and chat.
Netherlands
EU
Google Workspace delivers a cloud-based suite combining Gmail, Calendar, Meet & Drive to enhance collaboration through tools like Docs and Sheets. Offers secure storage options, custom domain emails, and robust management capabilities with 2FA and 24/7 support.
United States
Icedrive is a cloud storage, backup and file sharing service with browser, desktop and mobile apps.
The Icedrive desktop application allows users to mount their cloud storage space as a real hard drive.
United Kingdom
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
Suite for secure email, calendaring, file sharing, chat, and online meetings, offering real-time collaboration on docs, GDPR compliance, customizable branding, renewable energy use, advanced user management, and all data hosted in Switzerland.
Switzerland
Subscription offers expanded shared storage for Drive, Gmail, and Photos; automatic backup for devices; uncompressed media support; cross-device access; family sharing for up to 5 members; dedicated support; and perks like Play credits and special hotel rates.
United States
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
United States
Krakenfiles is a file storage. It offers unlimited file storage and 20 MB file upload size. You will have your page when you register.
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
A privacy-first, all-in-one ecosystem that replaces Google Workspace and Creative Cloud. Features encrypted email, cloud storage, and docs, alongside a browser-based 3D animation engine and AI assistant. Your data stays yours.
United States
WikiSuite™ is especially suited to knowledge-centric organizations and offers most (80%+) of the data and information management features all organizations need.
Canada