A couple of people have mentioned Evernote, which is a great product, and a great service, with a great plugin for Chromium-based browsers (even Edgium!). However, I love me some markdown, so I've started using Boostnote for my actual "thought" notes. I like it quite a bit, and I've found a few tools that help me "clip" articles from the web and turn them into markdown. So far, I prefer `clean-mark` (https://github.com/croqaz/clean-mark#readme), because it has more consistent conversion and better meta-data generation, but I've also used `hget` (https://github.com/bevacqua/hget), which, in my experience, is not as robust but sometimes catches things that `clean-mark` misses.