Encipher.it - Encrypting email with Encipher.it is a simple way to protect your sensitive data.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Gofile.io - You can upload your files without registration, There are no limits.
Autocrypt - Convenient End-to-End Encryption for E-Mail
Temp.PM - Temp.PM - Temporary Private Message
CrococryptFile - Strong file encryption tool