1. SHA1
    Secure Hash Algorithm 1 (SHA1) is defined in RFC 3174, and therefore more-or-less counts as a protocol
  2. sha3
    This library is an implementation of the Secure Hash Algorithm 3 (SHA-3), also known as Keccak
  3. shallow-copy-array
    SHALLOW-COPY-ARRAY is a member of the Common Lisp Utilities
  4. shared-preferences
    shared-preferences notably allows flexible specification of package-local preferences
  5. sharp-bq
    A construct borrowed from the Lisp Machine, e.g
  6. sharplispers
    A group of Common Lisp hackers who occasionally maintain otherwise abandoned or quasi-abandoned Common Lisp software packages
  7. Shawn Betts
    Shawn Betts is a person who has never found a language that is as fun to code in as Common Lisp
  8. SHCL
    SHCL is
  9. Sheafhom
    Sheafhom is a package by Mark McConnell for large sparse linear algebra computations over the integers and other exact number types
  10. Sheeple
    Sheeple is a delegative prototype-based object system inspired by CLOS