Nextcloud is an open-source, self-hosted file sharing and collaboration platform that allows you to store and share files, contacts, calendars, and more. Nextcloud Desktop is a client for Nextcloud that allows you to synchronize files between your computer and your Nextcloud server.
The source code for Nextcloud Desktop is available on GitHub under the Nextcloud organization. You can find the Nextcloud Desktop GitHub repository here: https://github.com/nextcloud/desktop
You can use Nextcloud Desktop to synchronize files between your computer and your Nextcloud server, and also to access other Nextcloud features like contacts, calendars, and tasks.
It’s important to note that Nextcloud Desktop is not an official Nextcloud product, and it’s an open-source community-driven project. It’s available for Windows, macOS, and Linux. It’s advisable to check the client’s website for the most up-to-date information and instructions about the installation process, dependencies and system requirements.