Can archive box aggregate content "bookmarked" in different places?

I want a tool that will pull saved items on Reddit, favorite posts on HN, etc. in addition to bookmarks posted to pinboard.in to a single place. In many ways, the share functionality in iOS allows me to get all URLs into a single place, but this doesn't help on desktop.

I know this isn't necessarily and easy task, if APIs aren't available. I'd be OK with a client component or browser extension, if it was open source and self-hostable.