Do not install LibreOffice

I have a lot of reasons for it: I open documents very rarely, and when I
need to, it's more comfortable to do under Ubuntu VM than on OS X.
Don't install Flash, Firefox and Evernote

Flash uses too much energy, same with Firefox (though I like it; it is
ugly but it does the job and does it well, but I want to try new Safari
instead). Evernote is a piece of shit, why would you need it anyway when
you have Finder that does pretty the same job (okay, along with
Notational Velocity and Preview).
Don't install Bittorent Sync

The concept is a masterpiece. Though it is quite ugly and I almost don't
use it, and it is proprietary. Still better than Dropbox or any other
alternative, though.
Fuck PGP

GPG is a blotware. And I don't like PGP too: I don't see any pros in
*Web of Trust* concept, at least in small scale. I like how <keybase.io>
does it, though, but still S/MIME seems to be way more usable than
current PGP with its isolated marginal community.
Don't install Crypt

Crypt is fucked. Often it doesn't work because it tries to send
a "current price" request or something like that to some server, but
fails. So, sometimes when you need it, you just *can't* use it. BS!

And you don't really need it when you get S/MIME cert.
And it is pretty ugly.
Use MPlayerX instead of VLC

VLC is just as fucked as Firefox. Bloated with features that nobody use.
And they both use too few native features, reimplementing lot of stuff
that doesn't have to be reimplemented.

On my box VLC stopped opening .mkv files, and MplayerX still does open
them. So that's why I switched.

And yes, MPlayerX has a lot of handy shortcuts for audio track switching
and subtitle switching, and overall does the job pretty good. Sometimes
I miss VLC 100%+ volume though.
Install Kaleidoscope