Nextcloud

vs

Google Drive

Librevault allows you to transfer data directly from one device to another, securely. Librevault is a free and open-source peer-to-peer file synchronization software, designed with convenience. privacy and security in mind. The software encrypts all data with AES-256 and uses TLS for all transmissions. Their goal is to make a better alternative to BitTorrent Sync and Syncthing.

With ownCloud, organizations can collaborate and be more production on their own secure enterprise file sharing (EFSS) platform. The ownCloud platform is self-hosted and allow for secure file sharing within an organization. The platform can be hosted on premise or on a cloud instance, controlled by the organization. The software is written in PHP and Javascript and is fully open source, released under the AGPLv3 license. ownCloud can run on most server hardware and operating systems, and the client for accessing ownCloud is available for Android, iOS, macOS, Linux and Windows.

The Auckland-based MEGA is a cloud service that provides 50GB of free storage space. With MEGA users can store, access and share files from anywhere. The company prides itself on building a powerful, convenient and privacy focused service that can be accessed via the web browser as well as natively on Android, iOS and Windows Phone.

iCloud is a cloud storage service provided by Apple, the service is provided freemium to all owners of Apple devices like iPone, iPad and Mac's. With iCloud users can store and acces their photos, videos, documents, notes, contacts, and more.

Store your files in the cloud with Dropbox and use them across all your devices or share them with friends. Dropbox is a cloud backup services that can be used to store your files online in a secure fashion. With Dropbox you receive 2GB of free storage space when your register, you also get 500MB extra storage for every friend you refer. If you want more you have to opt for a paid subscription.

A cloud synchronization service for sharing files across computers and other devices. SugarSync allows you to backup, access, sync, and share files across variety of operating systems, such as Android, iOS, Mac OS X, and Windows devices. SugarSync also support Linux through third-party clients.