There really is no "target" audience of this post. :) It just started out as a list of "recommended" tools, then people started suggesting stuff -- some of which I knew, some of which I don't, some of which run on every unix, some only on Linux.

And it was easiest to take the screenshots from my OS X laptop. For some tools, like powertop, I had SSH-d into various Linux or FreeBSD boxes.

Some of these are uncommon enough that they are not ported to every package manager system, too. :(

Out of curiosity, which?

Edit: looking at the site again, at least one of those screenshots is from OS X. htop lists /sbin/launchd and several processes from /Library/Frameworks.