This GitHub repository contains text files. I think that every item except tulip seeds/bulbs are there.
Oh, I forgot all of the buckets!
Will you add seeds/bulbs soon?
No, those need their own warehouse, as do paints.
There are 65536 tulip variations, and 148 paint variations.
At last, a definitive number!
This is great! Now we just need to update the wiki entries on each one (the wiki is about two years out of date).
[Also, you need to add a disclaimer that it doesn’t include any glitched items (‘unknown’ items).]