Kolab is described as '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' and is a Calendar app in the office & productivity category. There are more than 50 alternatives to Kolab for a variety of platforms, including Web-based, Linux, Android, Windows and Self-Hosted apps. The best Kolab alternative is Microsoft 365 Copilot, which is free. Other great apps like Kolab are Google Calendar, Fossify Calendar, Google Workspace and Roundcube.
Office suite offering productivity tools, document creation, and collaboration. Features AI-enhanced editing, mobile app access to documents and shared workspaces. Formats include word processing, spreadsheets, presentations, and email services.
United States
Manage events seamlessly with syncing across devices, automatic event creation from Gmail, shareable schedules, customizable reminders, and a user-friendly interface. Features include dark mode, integration with Google services, and support for recurring events and global time zones.
United States
Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.
India
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
Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.
Switzerland
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.
Germany
EU
A simple calendar with optional CalDAV synchronization. You can easily create recurring events and setup reminders, it can also display week numbers.
Israel
Brings together calendars, to-dos, productivity apps, and schedulers in one platform. Integrates with major services like Google Calendar, iCloud, Todoist, and video conferencing tools such as Zoom. Offers native scheduling similar to Calendly, enhancing time management efficiency.
Switzerland
FranceEU
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
Right Calendar app is a versatile scheduling tool that offers unparalleled flexibility to its users. One of its standout features is that it is built on an open-source platform. This not only ensures transparency but also allows for constant updates and bug fixes from a...
Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.
United States
