The source of pdfposter and its siblings is maintained at GitLab. Patches and pull-requests are hearty welcome.
You may browse the current repository at the Repository Browser
Or you may check out the current version by running:
git clone https://gitlab.com/pdftools/pdfposter.git
Please submit bugs and enhancements to the Issue Tracker at <https://gitlab.com/pdftools/pdfjoin/issues>.
Historical Note: pdfposter was hosted at origo.ethz.ch, but this site closed at 2012-05-31. Then pdfposter was hosted gitorious.org, which was closed May 2015.