https://trillian.im/
Trillian is easy-to-use, HIPAA-compliant instant messaging for people, business, and healthcare. Send messages, share files, and much more!
secure instant messagingtrillianmodern
https://portableapps.com/news/2021-04-29--telegram-desktop-portable-2.7.4-rev-2-released
A new version of Telegram Desktop Portable has been released. Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed....
telegram desktop portablerevsecureinstant