Nextcloud

Nextcloud Server describes itself as a safe home for all your data, and that is the whole pitch: files, calendars and contacts live on a server you choose rather than one you rent sight unseen. The result is the convenience of a hosted service without handing custody of the content to it.

The server is a base that other software extends. Hundreds of apps, among them Calendar, Contacts, Mail and video chat, are published in an app store and installed into a running instance.

Four things sit at the center of what it does.

• Access: files, contacts, calendars and more, stored on hardware of your choosing.
• Sync: the same material kept current across every device you use.
• Share: access handed to other people, either to view or to collaborate.
• Security: encryption mechanisms, two factor authentication and a HackerOne bounty program.

Getting an instance takes several forms. You can sign up with one of the listed providers, install the server yourself or through a ready to use appliance, buy a device that arrives with Nextcloud preinstalled, or hand hosting to a service provider, with Nextcloud Enterprise offered by Nextcloud GmbH for larger, public sector and education deployments.

Contributions land under AGPLv3, no contributor license agreement is required, and copyright stays with the individual contributors. Development uses PHPUnit and Behat on the PHP side, with Vitest and Playwright covering frontend and end to end tests.