Motif-based PDF reader using the Poppler library

 xpdf is a light-weight open source viewer for Portable Document Format (PDF)
 files (also called 'Adobe Acrobat' or 'Acrobat' files). This is just the
 xpdf viewer client; various command-line pdf tools are now provided via the
 poppler-utils package.
 .
 Debian's xpdf is a fork of Xpdf version 3, modified to use the Poppler
 PDF rendering library but keeping the Motif toolkit, and nowadays maintained
 as the xpopple project.