1281. Features
      Common lisp allows implementations to have extensions, and has an official way of testing for them, via membership of the *features* list
1282. Felip
      Hello, I'm Felip
1283. FEMLISP
      FEMLISP is a Mathematics Application which solves partial differential equations with the help of the finite element method (FEM)
1284. fern
      An efficient, consp, self-adjusting key-value trie-index abstraction for uuid namespaces
1285. ffa
      Foreign friendly arrays for Common Lisp
1286. ffi
      FFI is short for Foreign Function Interface, which is useful for linking to arbitrary C (and not only) libraries from Lisp code
1287. 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
1288. FFT
      A Common Lisp library to do Fast Fourier Transform on a multi-dimensional array of numbers
1289. Fibonacci
      The Fibonacci sequence of numbers was described in a mathematics book by Leonardo da Pisa (Fibonacci) called Liber Abaci
1290. file format
      This is a page collecting libraries to handle different file formats

CLiki the common lisp wiki