Top Alternatives to Kolab Community

Google Calendar is a robust, cloud-based scheduling and time management platform developed by Google. It allows users to create and manage events, set up reminders, share calendars with others, and sync seamlessly across devices, making it an essential tool for personal, academic, and professional organization.

Zoho is a comprehensive suite of online business applications offering solutions for CRM, office productivity, collaboration, IT management, and more. It provides a unified platform to streamline various business operations.

Roundcube is a free and open-source webmail client providing a modern, user-friendly interface to access and manage your email via IMAP. It is designed for easy self-hosting and offers extensive customization options.

Zimbra Collaboration Suite is a comprehensive open source email and collaboration platform designed for businesses. It provides a secure and feature-rich environment for email, calendaring, contacts, tasks, and file sharing, supporting on-premises and cloud deployments.

Microsoft Exchange Server is a robust mail and calendaring server designed for businesses of all sizes, providing enterprise-grade email, calendaring, and contact management capabilities.

OX Open-Xchange is a comprehensive web-based suite designed for communication, collaboration, and office productivity, offering features like email, calendaring, task management, and document sharing, seamlessly integrating across devices.