xpdf

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.