Free to print
The Ship Alone toolkit
The 3 forms I actually use, taken word for word from the books' appendices. Print one, fill it in with a pen, and keep the old ones. (The old ones are the useful part.)
From Nobody Bought It
The Autopsy Card
One card, filled in the week a product dies, while it still stings.
From Who Pays for the AI?
The Cost Sheet
One page per feature with a model inside it, filled in before you build.
From The Second Product
The January Page
One page, once a year: every living product, one line and one word.