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Another open source reference manager : Paperpile

From a blog post here, I found out about Paperpile. I downloaded and ran it, but haven't used it, since I use my own, but Paperpile has  a nice clean look. Though there is GPL code of Paperpile on github, the main website seems to indicate the author has hopes of commercializing (and closing the source) to Paperpile if things look successful.
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