Alice and Bob • A free, light and easy to use PGP tool
aliceandbob.io
A free, light and easy to use PGP tool. Helps you to generate PGP key pairs with custom params, encrypt and decrypt messages. This user-friendly tool is based on OpenPGP.js, a project which aims to provide an Open Source OpenPGP library in JavaScript.

I know this might be more tightly knit to encryption but I do not think it is entirely irrelevant for this community.

Question is in the title.