Isn't Free/OpenSource software choice is very limited ?
On Google, a "Free Software" search returns 104 million references while "proprietary software" (its opposite) only returns 2 million links.
When installing a Ubuntu Linux distribution (as example), ~25 000 different, selected softwares are included, freely available from the Ubuntu network servers, free of charge. And some famous are not even in this subset: GoogleEarth, Skype, Webmin, ... are not in this "short" list, but are however available for Linux, freely, from their respective web sites.