>>168Tor/.onion as you said. In the same vein, .i2p (ideally through i2pd to avoid javashit)
FreeNet, as long as you make sure to exclusively run it on an encrypted drive. The downside is that you automatically seed random pieces of content from their network, not whole files but encrypted parts of files. The Upside is that every single page of them feels retro.
IPFS too, a bit. In the sense that the content on it is static, like most parts of most old sites used to be.
Zeronet doesn't really feel oldschool to me, mainly because it lives off javascript.
Honestly, I'm hoping for a new wild west opening up as P2P networks grow just slightly more refined and we can flee the censorship of the commercialized husk of what we once loved.