Paper harvester and metadata extractor now available on github

I'm glad to announce that Wolfgang Schwarz has made his 'OPP-tools' paper harvester and metadata extractor available on Github. This is the software that PhilPaper/xPapers depends on to collect article-level metadata for papers found on personal pages (see this page). Wolfgang has been improving his software and making it re-usable by third parties as part of our JISC-funded project. It's now GPL'd and available here.