If you use a Mac, DevonThink and its associated products are great examples of paid user agents that seek out and organize information for you. Their free trials are fairly generous.
The closest I’ve ever found is https://www.zootsoftware.com/ - famously championed by James Fallows of The Atlantic. I don’t believe its web crawling tools are as sophisticated as Devon Technologies’, but it can do a lot and has a lot of power tools to process what it ingests. I haven’t used it since 2010, so my information may be out of date.