Excel sheet
I made this Excel sheet months ago for my boyfriend and I to use to keep track of items we need/have. We printed them out and circle the items we have, and cross off the items we've turned in for quests. That way we make sure we don't sell things we need, and can start collecting things earlier (such as 24 wood or 15 fool's gold).
Not all of you are going to like the setup of this, I realize that. But for some of you, it just might work. You still have to use it in conjunction with west stats, but it helps keep track of all the products/items you'll need in all questlines (hopefully I didn't miss anything). It's a little squished, what with the addition of the new Raid questline, but it's still functional. Just don't forget to put what world it's for, so you don't get confused with multiple sheets.
The underlined numbers are the requirements for decision quests, so you may not necessarily need all of them. I know this isn't only what is being proposed here, but it might work for some of the people posting here. It's already saved me from taking notes on paper repeatedly when it comes to products.
Hope this helps some of you! It took me a while.