1. xlunit
    XLUnit is a Test Framework based on XPTest and JUnit
  2. XML
    The eXtensible Markup Language
  3. xml-emitter
    Often, programs have to generate XML output
  4. xml-mop
    Allows representing parts of XML documents as CLOS objects
  5. xml-psychiatrist
    xml-psychiatrist is an XML sanity checking/validation library written entirely in Common Lisp
  6. XML-RPC
    XML-RPC is a remote procedure call system using HTTP requests carrying XML data in distributed systems
  7. XMLisp
    XMLisp uses CLOS and the MOP in such a way as to read XML files into Lisp objects
  8. xmls
    Xmls is a small, simple, non-validating XML parser for Common Lisp
  9. XMLS-Tools
    xmls-tools is a library to supplement use of xmls
  10. xmls-valid
    xmls-valid was a Library for validating XML parsed by xmls against XML DTD style rulesets