Pieter Levels is the obvious one. Not really a neat polished “blog”, more like watching someone ship in public for years.

Josh Pigford / Baremetrics had some good posts too. And the old Indie Hackers interviews were good for this before everything got a bit too content-brained.

Honestly most of the best ones aren’t big polished company blogs, they’re usually one person posting consistently while they’re still in the middle of it.