Encyclopedia article containing a brief history of the language, a discussion of design and implementation issues, and the advances PL/I contributed to language design.

Project to create a native PL/I compiler using the GCC. Downloadable scanner and parser for pl1, and a set of test files and a very rudimentary build and test system.

How Multics was built in a high-level language. Compiler construction and compiler features.

IBM Enterprise PL/I for z/OS, AIX, MVS/VM, VSE, Windows.

Vendor of PL/I for OpenVMS and Tru64. Download documentation and kits for the PL/I compiler for OpenVMS for both Alpha and VAX, and kits of the PL/I compiler for Tru64. No-charge hobbyist licenses available.

Compiled by Robin Vowels.

Skeleton parser for PL/M implemented in Flex and Bison. The grammar describes PL/M 386 and where possible, will accept various other dialects.

Compiler product for Unix and Windows, from Liant Software Corporation.

Presentation comparing these programming languages, from a PL/I perspective.

One of the original "compiler compilers", XPL is a derivative of PL/I and was widely ported. Documentation, links, and resources.