Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
YAATA - YAATA app offers features that let you send multimedia files such as images, videos, audio, and GIFs, etc.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.