kalender.digital

Disroot is a community-run, privacy-respecting online platform that offers a suite of open-source cloud services for individuals and groups. Key features include email, file storage, collaborative document editing, calendar and contacts (CalDAV/CardDAV), chat and Mastodon hosting, Nextcloud-powered file sync, and straightforward account migration/backup options. Services are run on federated, libre software and funded by donations; there are no ads or commercial tracking. Benefit: provides a trustworthy, privacy-focused alternative to mainstream cloud providers for collaboration and personal data control.

fruux is a cloud-based synchronization service designed for contacts, calendars, and tasks, offering users a seamless way to keep their data in sync across multiple devices. Launched in 2012, it supports various platforms and allows effortless sharing and collaboration on calendars and contacts. With a focus on privacy and data security, fruux enables users to manage their personal information conveniently while ensuring that their data remains safe and accessible whenever needed.

IceWarp is an enterprise-grade messaging and collaboration platform designed as an integrated, self-hosted or cloud-based alternative to services like Microsoft 365 and Google Workspace. The platform consolidates business email, shared calendars, and contact management with collaborative workplace tools, including real-time document editing, team group chat (TeamChat), and high-definition video conferencing. Available for on-premise installation or deployment in sovereign private and public cloud environments, IceWarp emphasizes data privacy, cross-platform client compatibility, comprehensive administrative management, and standardized protocol support (SMTP, IMAP, CalDAV, CardDAV, and Exchange ActiveSync).

Kalendaro.online is an intuitive online calendar platform designed for managing personal and professional schedules. It offers features such as event creation, reminders, and the ability to share calendars with others. Users can customize their views and manage multiple calendars in one place. The platform emphasizes user-friendliness and accessibility, making it a convenient tool for individuals and teams to organize their time effectively.

Kolab Now is a hosted groupware service providing email, calendar, contacts, file storage, and collaboration tools for individuals and organizations. Key features include webmail with IMAP/SMTP access, shared calendars and address books (CalDAV/CardDAV), document and file sync, task management, end-to-end and transport encryption options, granular user and group permissions, and professional support with hosted accounts on European servers. Benefit: centralizes team communication and collaboration in a secure, managed environment with tools for scheduling, file sharing, and organized workflow.

Mailbox.org is a secure email service from Germany that combines encrypted communication, comprehensive office features, and strong privacy protection.