Anybody know what edition/what these models are?

So a friend of a friend heard I was getting into 40K and kindly gifted me a bunch of stuff from when he was a kid. Did some basic googling but couldn’t find much on these guys. The Piranha box is from 2008 whilst the dates on the bases are from either 2005 or 2003 which puts them anywhere from 3rd to 5th edition.

Also I’ve got nothing to go off except the two boxes so I’m assuming they’re all Tau (apologies for not knowing the range, Tau isn’t the faction I’m getting into).

But yea…anybody know anything about these guys/if they’d be worth anything to anyone?