rsync - Samba
Nextcloud - Online collaboration platform
Sourrce-code: https://github.com/nextcloud/server
Cryptomator
Encrypt Dropbox, Google Drive, and any other cloud. Cryptomator is free and open source.
7-Zip
BorgBackup
Syncthing
Duplicati
Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Freefilesync
Download FreeFileSync 11.11. FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
MEGA
MEGA provides free cloud storage with convenient and powerful always-on privacy. Claim your free 20GB now
VeraCrypt
VeraCrypt is free open-source disk encryption software for Windows, Mac OS X and Linux. In case an attacker forces you to reveal the password, VeraCrypt provides plausible deniability. In contrast to file encryption, data encryption performed by VeraCrypt is real-time (on-the-fly), automatic, transparent, needs very little memory, and does not involve temporary unencrypted files.
Dropbox
Dropbox is a modern workspace designed to reduce busywork-so you can focus on the things that matter. Sign in and put your creative energy to work.