LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
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.
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
MyChat - Secure instant messenger for any network
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.