1. UABCL
    UABCL, a Common Lisp implementation, is a port of ABCL to dotNet and Mono
  2. uax-15
    uax-15 is a Common lisp implementation of Unicode normalization functions :nfc, :nfd, :nfkc and :nfkd (Uax-15), much like the icu internationalization library
  3. ubiquitous
    Ubiquitous is a very easy-to-use library for persistent configuration storage
  4. ucons
    Unique conses and functions for working on them
  5. ucw
    UnCommon Web is a web framework
  6. UCW Tricks and Cookbook
    Creating a "modal" component
  7. UfasoftCommonLisp
    Ufasoft Common Lisp development system
  8. uffi
    CFFI is recommended as the replacement for UFFI.
  9. ugly-tiny-infix-macro
    This is a powerful lisp macro for the purpose of writing your expressions in infix notation while not losing out on lisp's power
  10. uiop
    UIOP, the Utilities for Implementation- and OS- Portability, is a portability layer and basic utility library that comes as part of ASDF 3