While Zettelkasten is about developing ideas, not collecting them, it is still useful to archive resources/references to avoid link rot.
ArchiveBox—fetches page with multiple methods, downloads videos, git repos, etc. Bad storage layer (all files must be present on the fetcher computer)
Perkeep—general archiving tool that uses content-addressable store. Great storage layer, no direct support for web archiving, or serving archived pages.
SingleFile—a browser extension to save pages as single-HTML files (by inlining images as base64 blobs)
pywb—has a WARC viewer