Proton Drive is described as 'Emphasizes privacy with end-to-end encryption, Proton Drive safely stores, synchronizes, and shares files across devices via web and mobile applications' and is a very popular Cloud Storage service in the backup & sync category. There are more than 50 alternatives to Proton Drive for a variety of platforms, including Web-based, iPhone, Android, iPad and Android Tablet apps. The best Proton Drive alternative is Nextcloud, which is both free and Open Source. Other great apps like Proton Drive are Dropbox, Google Drive, MEGA and Filen.
Desktop app to view your photos like you do in Google Photos or Apple Photos (e.g. Calendar, list, map, etc..) but locally and respecting metadata open standards (not creating a separate database to store that information*).
Edelcloud is a secure cloud storage where you can store your personal files and access them from anywhere!
cryptfiles.cloud is a file-sharing service with end-to-end encryption. Users can share files and earn money from their uploads.
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