Apps to Calendar Integration

Evolution is a comprehensive personal information manager for the GNOME desktop environment, designed to manage emails, contacts, calendars, and tasks. It provides a unified interface for various communication and organizational needs.

Ubuntu Touch is a mobile operating system based on Ubuntu, offering a privacy-focused experience with a unique gesture-driven interface and convergence capabilities, allowing your phone to act as a PC when connected to an external display.

Tasks is a versatile task management application designed to help individuals and teams organize, track, and prioritize their work effectively. It offers a wide range of features including cloud synchronization, project management tools, and integrations with popular services like Alexa and Dropbox.

todoyu is a comprehensive web-based collaboration and project management solution designed for teams and businesses of all sizes. It integrates essential tools like task management, time tracking, resource planning, a shared calendar, and client interaction features into a single platform.

Portofino is an open-source web application framework designed for Java and Groovy developers. It simplifies the creation of enterprise-grade web applications by providing robust features for CRUD operations, content management, and business logic implementation.

KMail is a powerful and flexible email client tightly integrated with the Kontact personal information manager suite. Part of the KDE ecosystem, it offers robust features for managing your email, including strong encryption options, support for multiple protocols like IMAP, POP3, and Exchange, and seamless integration with other Kontact components like the calendar and address book.

Apache OpenMeetings is a robust, open-source web conferencing and collaboration software. It provides a comprehensive suite of tools for online meetings, presentations, training, and group activities, all accessible directly through your web browser.

Framadate is a free, ad-free online service designed for scheduling appointments and making group decisions through simple polls. It emphasizes privacy and ease of use, requiring no registration to create or participate in events and polls.

Cozy is a personal cloud platform designed to give users control over their digital lives. Store, sync, and share your photos, files, contacts, and calendar in a private and secure environment. It offers a suite of integrated applications to manage your data.

Nextcloud is an open-source, self-hosted platform for file synchronization, sharing, and collaboration. It provides a private alternative to commercial cloud storage services, offering a comprehensive suite of tools including file management, calendar, contacts, and notes, all under your control.

Lightning is a comprehensive calendar and task management add-on for Mozilla Thunderbird and Seamonkey, designed to integrate seamlessly with email. It offers robust features for scheduling, task tracking, and synchronization with various online calendar services, enhancing productivity directly within your email client.

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.

Hubzilla is a comprehensive platform for building decentralized, interconnected websites with a focus on identity, privacy, and communication. It provides tools for social networking, content publishing, and secure interactions across the federated web.