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

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

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

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

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

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

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

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

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/