Six digital publishing startups to watch

You know you can blog with Tumblr or WordPress, or self-publish a book on Kindle or iBooks. But what’s next for the publisher who wants to sell a mobile-native magazine, or the blogger who’s sick of messing with plugins?

Here are six startups that offer new options to creators. Three of them — Periodical, 29th Street Publishing and Creatavist — let you create and sell mobile-friendly magazines, ebooks and newsletters; the other three — Postach.io, Ghost and Glipho — aim to let you blog in a new way.

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