Since I've been working a lot in Keynote to deliver quick design prototypes and decks for clients, I've managed to create a simple and easy-to-use IA (Information architecture) template to showcase web app/site structure right in the keynote without using third-party software to create sitemaps.
I believe user interface should start with words. Writing first makes me treat UI as a conversation.
Inside the attached .keynote file you will find a link to Google doc where I outlined IA architecture on a real project from the past.
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