The one for reddit is :https://rdx.overdevs.com/ I think nitter was like this too ? Not sure as i have never used it or is just a site to see the posts sent to you ? I think piped works in this same manner for youtube so going to link a client too : https://f-droid.org/packages/com.github.libretube/ . I know barinsta used to be a thing until zuck went after the dev so is there any instagram scrappers now i would love one because then i can actually see what my friends sent me or know what their up to .
Not included in the above, but handy is also an alternative web UI for Reuters news: https://neuters.de
If the site isn鈥檛 too JS dependent, you can browse with something like lynx and that helps. Otherwise decrapifying tends to be site specific. I鈥檝e done a few for sites that I frequent, but it is tedious. Alternatively you could use archived snapshots.
Edit: Sorry didn鈥檛 read through your post, your title is a bit misleading. I don鈥檛 think this will work with instagram or twitter or other related stuff. I still leave my comment in case someone will find it interesting to scrap webpages offline.
Something that works great but isn鈥檛 perfect, is to selfhost something like read-it-later (wallabag.
It takes away all the crap and you can even read it later offline with an android (don鈥檛 know about ios), and has nice firefox addon.
It鈥檚 not perfect because it won鈥檛 work for some sites, I encountered some scraping bugs or sites that didn鈥檛 work, but most of the time it works great :).
You can even help to make wallabag better.
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not a webpage, but for those looking for a third party twitter/X viewer: