I feel someone should include Marco Arment [twitter.com/arment] in this list. I don't know if he's a "master," but I have found his journey of building one-man projects to be inspiring.
Also, Maciej Ceglowski [twitter.com/pinboard]. His twitter is hilarious, even though I don't personally subscribe to his service.
Also, Maciej Ceglowski [twitter.com/pinboard]. His twitter is hilarious, even though I don't personally subscribe to his service.