#3 looks suspiciously ferny to me, but I couldn't tell you which it might be. It's not one of the 50 - 60 that I have, though, so I could tell you what it's not. I would venture, though, that *IF* it is a fern it's an epiphyte...
#4 looks like some of the clover that grows in my yard, but, again, I couldn't tell you what, exactly, it is. Mine are about 3" across.
#6, 7, & 8 look to be a kind of pitcher plant
, which is carnivourous, so feel free to keep it in the kitchen if you have gnats about the fuit bowl, and it should be quite happy with you.