The PDF::Reader library implements a PDF parser conforming as much as possible to the PDF specification from Adobe.
https://github.com/yob/pdf-reader
230 forks.
1.406 stars.
70 open issues.
Recent commits:

• Merge pull request #331 from yob/update-flate-specsImprove and fill in some specs for inflating streams, GitHub
• fill in some missing specs for PDF::Reader::Filter::Flateconfirm we can inflate:1. RFC1950 zlib stream2 RFC1951 raw DEFLATE stream3. RFC1952 gzip stream (probably not strictly required, but easy to include because zlib handles it), James Healy
• restructure some specs for deflating broken zlib streamsI've learnt more about why we can't inflate this stream (it's a zlibcontainer stream with a broken adler32 checksum). Now the spec describesthe issue better.Still no fix for it though, I can't find a way to ask the ruby zlibbindings to ignore checksum failures., James Healy
• update stale comment* use correct RFC number* remove dead link, James Healy
• Merge pull request #330 from yob/buildkiteswitch from travis to buildkite, GitHub