Think:
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Dan Rowden's Ilo.so which is not solely his main product, but it reinforces his BiP journey with network effects and viral loops
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Typefully, a tool made by Mailbrew's @Linuz90 and @Frankdilo. As Typefully (a side-product, when compared to Mailbrew) grows, the two gentlemen's story piggybacks as well.
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Classic example: Basecamp launching their books, Ruby on Rails or countless other side-projects that reinforce their main story
My personal examples:
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The Build in Public Cheatsheet I'm building (thanks for reading it!)