CarotDAV is a Simple WebDAV / FTP / SkyDrive / DropBox / GoogleDrive / Box / SugarSync client for Windows OS, available free of charge. It is also able to read GoogleDocs or IMAP.


Koofr is described as 'Safe, secure and simple way to store, backup and share your documents, photos, videos and more. It offers up to 10 GB of free safe storage for your files with affordable upgrades and options to connect multiple cloud accounts' and is a very popular Cloud Storage service in the backup & sync category. There are more than 100 alternatives to Koofr for a variety of platforms, including Web-based, Windows, Mac, iPhone and Android apps. The best Koofr alternative is Dropbox, which is free. Other great apps like Koofr are Syncthing, Google Drive, MEGA and Filen.
CarotDAV is a Simple WebDAV / FTP / SkyDrive / DropBox / GoogleDrive / Box / SugarSync client for Windows OS, available free of charge. It is also able to read GoogleDocs or IMAP.


Open-source, privacy-focused cloud storage using zero-knowledge encryption and blockchain technology, provides secure file transfer, end-to-end encryption, free 10 GB plan, desktop and mobile support, full user control, and no data tracking or ads.



Open source, self-hosted suite featuring mail, calendar, drive, and contacts. Provides privacy without analytics or ads, file versioning, sharing, recurring calendar events, and compatibility with open standards, keeping control and portability with the user.




Expanded storage, access to Google experts, and more — in one shareable plan.




woelkli is a service that provides secure cloud storage hosted in Switzerland. Save, view, edit and share your files from anywhere in the world, from any device


Perkeep is a set of open source formats, protocols, and software for modeling, storing, searching, sharing and synchronizing future-proof data. Data may be files or objects, tweets or 5TB videos, and you can access it via a phone, browser or FUSE.

Round Sync helps you to manage your files, everywhere you go, on your local device or on most cloud providers.




Open Source cloud file storage server (similar to Google Drive). Host myDrive on your own trusted server or platform, then access myDrive via your web browser. MyDrive uses mongoDB to store file/folder metadata and supports multiple databases to store file chunks, such as Amazon...




The only automated sync, back-up, collaboration and file management service powerful enough for a business user and easy enough for a novice. Secure, anywhere access to your files.



CloudMe is a free and open service to sync, store and make all your files available in the cloud through an easy to use Blue Folder.



OwnDrive is a security and privacy oriented cloud storage service that gives access to people’s data anywhere, anytime and from any device. OwnDrive makes storing, syncing and sharing of data easy. Our users have the ability to store, sync and share files, contacts, calendars...



Internxt has a problem with E2E encryption https://medium.com/@y5dt9t/internxt-review-a-case-study-on-how-not-to-do-end-to-end-encryption-ca4c1f6f4620