Google Calendar Alternatives for Online

Kolab Community is a comprehensive, free, and open-source groupware suite designed for collaborative work. It provides integrated email, calendar, contacts, and tasks functionalities, empowering individuals and teams to communicate and manage their data efficiently and with a strong focus on data privacy.

fruux is a robust cross-platform synchronization service designed to keep your contacts, calendars, and tasks seamlessly in sync across all your devices and applications. It offers a secure and reliable cloud platform with strong privacy focus, ideal for individuals and teams needing consistent data access and collaboration.

Microsoft Calendar, part of the Outlook suite, is a robust online calendaring platform designed for scheduling, organization, and collaboration. It allows users to manage appointments, events, and tasks effectively, integrate with other services, and share schedules with others.

MIDAS is a comprehensive web-based room and resource scheduling software designed for organizations of all sizes. It facilitates efficient management of spaces, equipment, and staff, streamlining the booking process and preventing conflicts.