1. Let Over Lambda
    Let Over Lambda is a book about advanced Common Lisp programming techniques written by Doug Hoyte
  2. let-plus
    LET+ extends let* with destructuring forms, slot access, hash table elements and various other constructs with a consistent interface
  3. Levenshtein
    The Levenshtein Distance algorithm finds the minimum number of operations needed to transform one string into the other, where an operation is an insertion, deletion, or substitution of a single character
  4. Levente Mészáros
    A lisper
  5. lexer
    Lexers (also called tokenizers) can be used to prepare a string or stream of character data into a form suitable as an input for parsers generated by parser generators
  6. lfarm
    a library for distributing work across machines using the lparallel API
  7. lfe
    LFE, Lisp Flavoured Erlang, is a lisp s-exp syntax front-end to the Erlang compiler
  8. LGPL
    LGPL refers to GNU Library General Public License, also known as the Lesser General Public License
  9. lgtk
    Lgtk is Common Lisp GTK binding; not available for CLISP
  10. lh-usb
    lh-usb is a set of bindings for the Linux usbfs interface for writing usb device drivers from user-space Lisp code