To co-opt what someone else said, in order to find what you're looking for from the 90s, you kinda have to go look at bands from the 90s and pray they're still together.
I know they plagiarized some old blues stuff, but all musicians do to some extent, and those old blues tunes were forgotten then and would still be forgotten if Zep hadn't brilliantly rearranged them.
I mentioned some of my current favorite artists in another post, but try Oneohtrix Point Never (Daniel Lopatin) or Tim Hecker, these guys are doing crazy things today. Honestly, I was a Zep fan, still am a Zep fan and think that there is no comparison to Zep. But OPN and Hecker will blow you away much like Zep can blow you away, if you give them a chance. Just my opinion of course ;)
You could actually understand what Robert Plant was singing. The biggest problem with many of today's bands is that the words are usually unintelligible (often because music is being played loudly over them).
In contrast, I think part of the appeal of rap is that you can actually understand the words. You might not like them, but you can understand them. E.g. In Da Club by 50 Cent. Great beat, easily understood words.
Indy recordings are not all good, sometimes they play some kinda crappy, pitchy local artists but at least it's not the record industry decreed crap everybody else plays. And there are some treasures out there.
Edit: Obviously nowhere near the stature and influence of Led Zeppelin, but the sound might satisfy you in some ways.