NFC is near field communication. Yes, it is used by apps, although probably not to spy on you. It is used for things like Google Wallet, so you can place your phone against a receiver (or another device) and transfer data. It has to be very close though, nearly touching, so there aren't many ways that I can think of that it could be used to spy on you.
As for the others, I don't know what all of them do off the top of my head. Some thoughts though:
I'm guessing this is an Samsung device. At least some of these are used by Samsung for TouchWiz and layered on top of stock Android (com.secandroid app camera and com.secandroid app.launcher).
The "popupuirecevier" one was likely installed with an app to deliver pop-up advertising.
Also, are you sure that it isn't com.sec.android.gallery3d (sec with a "c" and not an "x")? That would be a photo viewing app. I'm not sure what it would be if it is actually com.sex.android.gallery3d. I would be suspicious that it is adware/spyware if you typed if correctly.