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ONLYOFFICE 7.5 now features a dedicated PDF editor.
(news.itsfoss.com)
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The entire app is open-source with an AGPL license (which is really nice). They do have pricing options for enterprise support, web editors, etc. which aren't important. They may include some closed source code for these features but I'm not 100% sure.
AFAIK it is all open-source these days (unlike before), but some features are disabled in the official easy to use binary releases. Not ideal, but you can find 3rd party container images with the stuff enabled again.