Homebrew: list the packages installed from taps?

This expression would return a list of installed 3rd party packages only:

brew list --full-name -1 | grep /

…for the respective list of taps in use, try:

brew list --full-name -1 | grep / | cut -d"/" -f1 -f2 | sort | uniq

I found a couple ways that work.

brew list --full-name

Slower, but a little more informative:

brew info $(brew list) | grep '^From:' | sort