GoodSync

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Filestash

Syncthing is a free and open-source continuous file synchronisation software that utilise peer-to-peer technology. The software allows users to send files between two or more computers in real time, safely protected from prying eyes. Syncthing is available for Windows, Mac, Linux, Android, Solaris, and BSD.

odrive is a unified cloud storage solution that allow you to sync unlimited storage securely and efficiently to a folder on your desktop. With odrive, you can sync, share and backup your files securely. odrive integrates with thrid-party solutions like Amazon Drive, Dropbox, Google Drive, OneDrive, Box, S3, WebDAV, FTP, and more.

Duplicati is a free, open source, backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. The software was designed from the ground up to handle online backups of data with high efficiency. The software integrates with Amazon S3, Backblaze (B2), Box, Dropbox, FTP, Google Cloud and Drive, HubiC, MEGA, Microsoft Azure and OneDrive, Rackspace Cloud Files, OpenStack Storage (Swift), Sia, Tardigrade, SSH (SFTP), WebDAV, Tencent Cloud Object Storage (COS).

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.

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 Box, you get a single place to manage, secure, share and govern all of the content for your internal and external collaboration and processes. Box provides a secure service that protects sensitive files in the cloud with intelligent threat detection, and complete information governance. All businesses depends on collaboration between people, from teams to customers, partners and vendors. With box it's easy to keep everyone on the same page while working on business critical content.