Open source softwares
There is a free, ethical, decentralized and solidarity-based alternative to most of the software on the market. You'll find an interesting selection here
For Windows : https://framapack.org/
For Mac : http://www.opensourcemacsoftware.org
Click on the various tabs: Office (e.g. LibreOffice), Graphics (GIMP), Internet (Firefox), Multimedia (VLC), etc.
Other links of interest, if you want to know more about the world of free computing:
FACIL for collective appropriation of free software
Framasoft, network dedicated to promoting “free” in general and free software in particular
Collectif des Hébergeurs Alternatifs, Transparents, Ouverts, Neutres et Solidaires (CHATONS) initiated by Framasoft