Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
File Lock PEA - Password-encryption of files and directories. File PEA encrypts files and folders with authenticated encryption to protect confidentiality and integrity. The program uses memory-hard key derivation functions to prevent custom hardware attacks.
WinGPG - WinGPG – an open source encryption tool for Windows
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
BestCrypt - BestCrypt Container Encryption supplies painless encryption to users for any selected files or folders on active desktops, shared workstations, removable storage media drives, network storage, etc.
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.