• Iron Spring PL/I Users' Forum (https://groups.io/g/Iron-Spring)
  Please note that we have moved from Yahoo groups.

The following links to other sites have been included as a convenience. Iron Spring Software takes no responsibility for their content.

• The PL/I Language
  PL/I compilers and Tools, PL/I Bibliography, PL/I Programming Style Guide, PL/I Sample Code.

• PL/I Resources
  PL/I Newsletter issues, IBM PL/I Connection issues, PL/I open-source code.

• IBM PL/I for MVS & VM Language Reference in Bookmanager format at IBM.

• Usenet comp.lang.pl1 newsgroup (also available on Google Groups).

• Iron Spring Software recommends Arca Noae
  Arca Noae brings OS/2 into the 21st Century

Thanks to the Internet Archive, the full text of the following introductory book on PL/I is available online:

• Abrahams, Paul. The PL/I Programming Language. (.pdf)
  
• Abrahams, Paul. The PL/I Programming Language. (kindle (.mobi))
  (Original scan at www.archive.org)