overGrive - Complete Google Drive desktop client for Linux
Cryptomator - When it comes to saving your files on a cloud server, it is important to ensure the security of those files. Keeping your delicate files out of the wrong hands can save you a lot of time and hassle. Read more about Cryptomator.
Syncdocs - Syncdocs syncs folders between all your PCs and Google Docs.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
drive-cli - Google Drive client for the commandline
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.