original article at zdnet 2017-Oct-4
The 21 apps are:Spotify
YakYak (instead of Hangouts)
GIMP (instead of Photoshop)
VirtualBox (instead of Parallels)
Inkscape (instead of Illustrator)
LibreOffice (instead of Office 365)
Auto Text Expander for Chrome (instead of TextExpander)
Dropbox
Tinkercad (instead of 123D Design)
Cura 3D printing slicing program
Slack
Evernote (web version)
Feedly
Google Keep
Kindle Cloud Reader
Todoist
PhpStorm and Eclipse
Chrome and Firefox
Gmail
LastPass (instead of 1Password)