#1 
Encrypted notes, tasks, calendar, files, passwords and a journal with mood and medication tracking, all unlocked by one 12-word recovery phrase. Sign up with no email and no password. Open source.
Freemium File Encryption
The File Encryption we recommend, filtered to Freemium. See all File Encryption →
#2 
Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to a cloud service.
#3 
GPG Suite brings OpenPGP encryption to macOS through a unified package: GPG Keychain for key management, GPG Mail for Apple Mail integration, GPG Services for system-wide encrypt/sign actions, and MacGPG as the underlying engine.