Nextcloud is the do-it-yourself choice, the only thing here you actually run yourself. It is open source under the AGPL. You can run it on a rented server or on your own hardware at home, even something as small as a Raspberry Pi. Because you host it, you own the server, the data, and the jurisdiction. Desktop, mobile, and web clients cover files, calendar, contacts, and more. The catch is encryption. By default your data is protected at rest with keys the server holds. An admin or a breached server can read it. End-to-end encryption is an opt-in, folder-level add-on rather than the default. It rewards people who want full control and can run a server. It asks more of you than a hosted service does.
Nextcloud
Open-source files you host on your own server.
nextcloud.com
FreeOpen SourceWindowsmacOSLinuxAndroidiOSWebSelf-hosted
Pricing The self-hosted software is free under the AGPL. Paid hosted and enterprise plans exist.
Strengths
- Open source under the AGPL; you control the server, data and jurisdiction
- Files, calendar, contacts and more, with clients on every platform
Considerations
- Default encryption leaves keys on the server, readable by an admin
- End-to-end encryption is opt-in and folder-level, not the default
- You have to run and maintain the server yourself
Listed in Cloud Storage
