Lost in reference

I have an evergrowing pile of unread but interesting paper in my download folder. With the size growing from several hundred MB to more than 2 GB, it is becoming hard to find a pdf file when I really need it. Back in 2015, I was annoyed and decided to look seriously for some tools that would manage the mess. I was looking for something which could retrieve metadata when importing pdf and searches fast in the database when I provide only a couple of keywords and then name of corresponding author (“I need the Jessell paper on *digits*”).