[m-p-3]

I personally save them using the SingleFile browser extension.

https://github.com/gildas-lormeau/SingleFile

[mgdlbp]

There's also ArchiveWeb.page, which records in the same WARC format as archive.org

https://github.com/webrecorder/archiveweb.page

[kristiandupont]

This is my alternative which tries to convert a page to Markdown: https://github.com/deathau/markdownload