Clipman
Clipman – free and open source clipboard manager developed for Xfce graphics environment
VeraCrypt – free and open source, multi-platform disk encryption software
Cryptomator – free and open source, multi-platform software for encrypting files in the cloud
Crypter – free and open source, cross platform user friendly and secure file encryption software
Brightness Controller – free and open source, simple utility to control brightness, RGB, and color temperature of displays in Linux