GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
PGP Tool - PGPTool allows you to encrypt and decrypt files. It's free and easy to use.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.