Important Free Software
Syncthing
Discussed here
timeshift
Discussed here
Donation link available at bottom of the developer’s website
Thunderbird
Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features!
Signal
end-to-end encryption (powered by the open source Signal Protocol) keeps your conversations secure
KDE
The org behind the KDE Plasma desktop and other great applications like kdenlive and krita
Libreoffice
Other Important Copyleft/Free Software
gimp
obs-studio
blender
Important People and Collectives
freecodecamp
GNU
FSF
EFF
SFC
Note-
Some privacy&security android apps listed here
Further Reading
Find free software! FSF-High Priority Projects