A Few PL/I Hints
   By Michael Rask Christensen, including sample programs.
   http://hjem.get2net.dk/micrask/pli/pli.html

AutoPLMtoc
   Automatically translates programs written in PLM language to C language. [Commercial]
   http://www.plmtoctranslator.com/

Datatek, Inc
   Provides automated programming language conversion services for PL/I, Cobol, and Fortran.
   http://www.datatek-net.com/dtk_conversion.htm

Development Assistant for PL/M
   An Integrated Development Environment (IDE) with Analyzer, Editor, Browser, Graph, Metrics.
   http://www.ristancase.com/da-plm/

Hello, World Program
   Classic test program, written in PL/1.
   http://www2.latech.edu/~acm/helloworld/pl1.html

IBM PL/I Overview
   IBM VisualAge PL/I for AIX, MVS/VM, OS/2, VSE, Windows.
   http://www-306.ibm.com/software/awdtools/pli/

PL/I Frequently Asked Questions
   Compiled by Robin Vowels.
   http://www.faqs.org/faqs/computer-lang/pli-faq/

PL/I Resources
   Links, tutorial, function library, book and course references.
   http://www.users.bigpond.com/robin_v/resource.htm

Power vs. Adventure - PL/I and C
   Presentation comparing these programming languages, from a PL/I perspective.
   http://www.uni-muenster.de/ZIV/Mitarbeiter/EberhardSturm/PL1andC.html

Robin Vowels
   General information, resources and FAQ about PL/I.
   http://www.users.bigpond.com/robin_v/

XPL Programming Language
   One of the original "compiler compilers", is a derivative of PL/I and was widely ported. Documentation, links, and resources.
   http://www.cs.toronto.edu/XPL/