1. Flexichain
    Flexichain is an API for editable sequences
  2. flexoplan
    Simple planner, TODO list and would-be ticket-system, written in CL
  3. float-features
    float-features is a portability library for IEEE float features that are not covered by the CL standard
  4. floating-point
    Floating-point is a Common Lisp library with functions for calculating
  5. floating-point-contractions
    Numerically stable, contracted versions of floating-point operations
  6. flood
    Comfortable, powerful and tiny logging library for common lisp
  7. floyd-warshall
    floyd-warshall is a (very) preliminary library for Floyd-Warshall all-pairs shortest-path algorithm computations on weighted directed Graphs, written by Robert Goldman
  8. Foil
    Foil (Foreign Object Interface for Lisp) consists of a protocol and a set of libraries that facilitate access to popular object runtimes, such as the JVM (Java) and the CLI/CLR (.NET), and their libraries, from Lisp
  9. folio
    [superseded by folio2] A set of modules that make some functional programming idioms more convenient for use in Common Lisp
  10. folio2
    A collection of small libraries: functional idioms and data structures in Common Lisp and a common set of APIs for them