1. Sycamore
    Sycamore implements several purely functional data structures in Common Lisp
  2. Sykopomp
    Some Persons believe Sykopomp to be a Person
  3. Symbol-Munger
    Symbol-Munger is a small library that provides functionality to ease conversion between the same symbol in different environments
  4. symbol-namespaces
    symbol-namespaces defines a new kind of package that's named by a symbol rather than a string
  5. symbol-namestring
    Reader macro originally developed by Erik Naggum
  6. SymbolicWeb
    SymbolicWeb is a GUI toolkit and web framework that uses the browser to render UI elements
  7. SYMTABLE
    SYMTABLE is a simplistic symbol-table abstraction
  8. syntax-case
    SYNTAX-CASE is a system for macros proposed by R
  9. system programming
    Libraries having to do with system programming - memory management, timers, system calls, etc
  10. system-menu
    system-menu is an in-development application based on cl-menusystem that is designed to provide a simple, abstract interface to operating on system definitions such as by asdf and mk-defsystem