If you aren’t, you should be using Zotero. It amazes me to see researchers ‘managing’ their references manually these days. It’s complicated, takes time, is prone to errors, and simply unnecessary. There are many options out there to manage your references, but you should look at the free and open Zotero. You can install it on all your devices, you’re not limited in the number of citations you can use, you can take it with you when you change workplace, and in fact you’re not even restricted to the feature of Zotero because you can use plugins. Seamless integration in word processors isn’t going to stand out from the competition, but getting stuff into Zotero takes no effort at all — it’s unparalleled easy with just one click in your web browser. You get free syncing, too. There really is no reason not to keep notes of what you are reading.
After grabbing Zotero, you probably want Zotfile, too. Zotfile manages your PDF versions of research articles. In my view, the most useful feature is the ability to extract highlighted text from the PDF. It’s so practical that I sometimes even don’t take proper notes (for the main points, you should store them in your brain anyway).
Image credit: Zotero, Zotfile
Didier Ruedin 