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Humble Bundle - Sir Terry Pratchett's Discworld
(www.humblebundle.com)
Anything related to the fantasy genre
It's non-linear to me but if something is mentioned in the book that happened in the past, I just read that book in the frame of being a prequel. It hasn't really turned into anything spoiler heavy. Though the City Watch novels are a lot more linear and tend to see a lot of character growth.