aptitude search '?installed (?section(restricted) | ?section(multiverse))'

sudo apt install vrms
vrms

Non-free packages installed on computer-name

app-shortname1                    Application long name 1
app-shortname2                    Application long name 2
app-shortname3                    Application long name 3

       Contrib packages installed on computer-name

app-contrib1                      Application Contrib Name 1

  3 non-free packages, 0.4% of 2381 installed packages.
  1 contrib packages, 0.1% of 2381 installed packages.