1. LIFT
    The LIsp Framework for Testing is another testing framework in the JUnit / SUnit lineage
  2. lightgbm
    Common Lisp interface to LightGBM
  3. LIJOS
    The LIJOS system is a Lisp Implementation of the Java ObjectStream
  4. Limp
    Limp, a Lisp IDE for vim
  5. Lindenmayer systems
    This application was written in Common Lisp (by Edi Weitz)
  6. linear algebra
    Anything to do with linear algebra or matrices
  7. Linear-algebra
    Linear-algebra is a Common Lisp library of numeric linear algebra routines
  8. Linedit
    Linedit is a portable line-editing console library for Common Lisp
  9. lineva
    Linear evaluation macro system for Common Lisp
  10. linewise-template
    A Common Lisp library for processing text files and streams as templates conforming to simple line-based hierarchical formats