I'm not the person you asked but I try to keep my gems in bookmarks, would love to share some. Obviously I don't know your interests so take it for what you will. I have many more than I'll post here if you want some.
Some of this came from HN, some from elsewhere.
This website lists the first references to some cultural icons on Usenet (for example the first time AIDS was ever discussed, first mention of a new TV cartoon "The Simpsons", etc.)
http://www.eightyeightynine.com/culture/80susenet.html
The Public Domain Review, a collection and analysis of interesting stuff in the public domain
https://publicdomainreview.org/
David Rumsey Historical Map Collection. I have spent many hours browsing the incredible content here.
https://www.davidrumsey.com/
Restoration Mustang. A high quality long term journal of the restoration of a classic Mustang. Think like an /r/diy project but with way more detail and over a longer time scale.
https://restorationmustang.com/
The Renegade Gardener. Highly opinionated no-bullshit gardening advice. I especially love the "Don't Do That" section.
https://renegadegardener.com/
Garden Myths. There's a lot of misinformation and old wives' tales in gardening, this website cuts the crap.
https://www.gardenmyths.com/
Million Short is a search engine that lets you cut out the million (or 10,000 or 100,000) top results from a search, really good for finding gems. It also has an option for removing e-commerce websites from search which is a godsend.
https://millionshort.com/
Some of this came from HN, some from elsewhere.
This website lists the first references to some cultural icons on Usenet (for example the first time AIDS was ever discussed, first mention of a new TV cartoon "The Simpsons", etc.) http://www.eightyeightynine.com/culture/80susenet.html
The Public Domain Review, a collection and analysis of interesting stuff in the public domain https://publicdomainreview.org/
David Rumsey Historical Map Collection. I have spent many hours browsing the incredible content here. https://www.davidrumsey.com/
Artvee. Free, high quality art. https://artvee.com/
Restoration Mustang. A high quality long term journal of the restoration of a classic Mustang. Think like an /r/diy project but with way more detail and over a longer time scale. https://restorationmustang.com/
The Renegade Gardener. Highly opinionated no-bullshit gardening advice. I especially love the "Don't Do That" section. https://renegadegardener.com/
Garden Myths. There's a lot of misinformation and old wives' tales in gardening, this website cuts the crap. https://www.gardenmyths.com/
Million Short is a search engine that lets you cut out the million (or 10,000 or 100,000) top results from a search, really good for finding gems. It also has an option for removing e-commerce websites from search which is a godsend. https://millionshort.com/
This one is relevant if you live in New Zealand and love the outdoors: Can I Light a Fire? https://www.checkitsalright.nz/can-i-light-a-fire