1. ffa
    Foreign friendly arrays for Common Lisp
  2. ffi
    FFI is short for Foreign Function Interface, which is useful for linking to arbitrary C (and not only) libraries from Lisp code
  3. ffigen
    FFIGEN (Foreign Function Interface GENerator) is a program suite that facilitates the writing of translators from C header files to foreign function interfaces for particular language implementations. -- FFIGEN Home Page
  4. FFT
    A Common Lisp library to do Fast Fourier Transform on a multi-dimensional array of numbers
  5. Fibonacci
    The Fibonacci sequence of numbers was described in a mathematics book by Leonardo da Pisa (Fibonacci) called Liber Abaci
  6. file format
    This is a page collecting libraries to handle different file formats
  7. file-position on non-files
    Here's a can of worms
  8. FILE-TYPES
    FILE-TYPES is a library to identify file formats based on file names
  9. filesystem
    cl-fswatch - Wrapper for fswatch, a cross-platform file change monitor cl-fuse - CL-FUSE provides Common Lisp bindings for FUSE (file system in user space) clufs - Common Lisp User Space File System purgatory - A client implementation of the Plan 9 File Protocol query-fs - Query-FS is a FUSE-based filesystem that presents database queries as filesystem trees
  10. Fileworthy
    A simple website to manage your local notes and files across many devices