I have been organizing these lists for a decade and unfortunately, most free tools have become pretty bloated with ads or confusing interfaces lately. The shared spreadsheets I used to recommend just aren't as good as expected when you need to track who bought what. It usually ends up being a mess of accidental duplicates. Here are the only ones I still find functional for a busy parent:

• Giftster: This is probably the most methodical free option. It lets you add links from any store and has a reserve feature.
• Elfster: Very popular for families, though honestly the layout is a bit chaotic and cluttered.
• Amazon Wishlist: Easy if you only shop there, but it doesnt play nice with other stores. If you need to get this to your mother-in-law tonight, Giftster is likely your best bet. It is free and definitely prevents the too many socks problem.

To add to the point above: watch for hidden subscription fees after trial periods, tbh.

• Verify pricing
• Check data security I'm satisfied with Share Product Wishlist because it's free and works well.

Just saw this while grabbing coffee. Like someone mentioned, those shared spreadsheets are a total nightmare once you get more than three people involved... honestly, I spent way too many hours trying to build a custom database for this years ago before realizing it just wasnt worth the effort. In my experience, you want something with a browser extension so you can just click a button on any site and have it pull the metadata automatically. I ended up sticking with Giftster for my family. Its free, handles the 'claimed' status perfectly so no double gifts, and you can add items from any store by just pasting the URL. The tech behind it is simple but the sync is solid. Plus, you can set up a 'secret' group so kids dont see what's being bought. TL;DR: Go with a dedicated registry tool like this site instead of docs. It saves your sanity and prevents duplicate socks.