A fascinating look at what's happening in open source development that might give some indications on what's to come:
http://opensourcesurvey.org/2017/
http://opensourcesurvey.org/2017/
An extension/accessory to PortableFreeware.com for items that don't fit on that site.
Definitely don't use a free browser or a free operating system (except all the major ones are). Anything besides Microsoft Office is unacceptable (never mind that their support is notoriously bad). Linux is open source and that's definitely been hijacked many times and caused all kinds of problems so now of course no one uses it except for most servers and most cell phones.