1. PostScript
    Datoura - The "Data Touring Machine" is a small, simple and powerful data analysis and plotting application, that generates postscript output PLisp - PLisp is an s-exp syntax for generating PostScript files
  2. pounds
    Provides two kinds of memory-mapped files: a database, and a circular log
  3. PowerLoom
    A (not written in Common Lisp) Knowledge Representation & Reasoning System
  4. PowerShell
    An experiment in sending tasks to PowerShell from CL
  5. ppath
    A path manipulation library inspired by Python's os.path
  6. Practical Common Lisp
    "Practical Common Lisp", an introduction to Common Lisp by Peter Seibel, available on the web at http://www.gigamonkeys.com/book/ and also in dead-tree form from Apress
  7. PRBS
    Library of pseudo-random binary sequence generators (LFSR-2 and LFSR-4) and related functions in Common Lisp
  8. pregexp
    Portable Regular Expressions for Scheme and Common Lisp
  9. PREPL
    prepl is a REPL implementation, also known as a Lisp listener
  10. pretend-event-loop
    This is a common lisp library that simulates an event loop