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Ask HN: How is there not a full-featured open-source PDF editor/viewer?
For almost anything you can think of there is a pretty awesome open source version of that software but for the life of me I can't find a truly full featured PDF editor that's 100% free. As PDF technology has been the preferred document of business for the last 15+ years I'm really surprised there isn't at least one open source project that's been a mainstay in this niche?!? What am I missing?