3 Types of Software
Bret Victor's first essay, “Magic Ink” menttioned that there're three types of software on the earth.
To learn: Information Software
To create: Manipulation software
To communicate: Communication software
Regarding Software Takes Command, Lev Manovichはこんな感じのこと書いてた
software: ぜーんぶ
application software: the subset of the software
media software: the subset of the application software