1. POSE
    Portable S-expressions are a form of S-expressions designed as an interchange format
  2. positional-lambda
    positional-lambda is a concise, intuitive and flexible syntax (macro) for trivial lambdas that eschews explicit (and often contextually-redundant) naming of parameter variables in favor of positional references, with support for a used or ignored &rest parameter and automatic declaration of ignored parameters when logical "gaps" are left in the positional references
  3. posix-shm
    posix-shm provides Common Lisp bindings to the POSIX shared memory API
  4. postmodern
    Postmodern is an interface to PostgreSQL SQL databases
  5. 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
  6. pounds
    Provides two kinds of memory-mapped files: a database, and a circular log
  7. PowerLoom
    A (not written in Common Lisp) Knowledge Representation & Reasoning System
  8. PowerShell
    An experiment in sending tasks to PowerShell from CL
  9. ppath
    A path manipulation library inspired by Python's os.path
  10. 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