Smashwords is a growing platform most folks here seem to like. From there you can reach kobo and barnesandnoble and ibooks and sony et al, without registering separately for each. I've heard mixed reviews of smashwords conversion quality though. Kindle is still the big kahuna, but they don't make it easy for indies to list books for free. There's a sticky post here in the writer's corner with additional perspectives and info.
I don't know of any integrated hybrid solution, but in addition to kindle, Amazon also runs a print on demand service.
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