1. RCL
    RCL is an FFI to communicate with the R statistics environment
  2. rclg
    An R (statistics programming language) FFI for Common Lisp
  3. RDF
    The Resource Description Framework (RDF) is a framework for representing information in the Web. Resource Description Framework (RDF): Concepts and Abstract Syntax
  4. RDNZL
    RDNZL (pronounced "Redunzl") enables Common Lisp applications to interact with dot-NET libraries
  5. rdp
    com.informatimago.rdp is a simple Recursive Descent parser generator
  6. re
    The re package is a small, portable, lightweight, and quick, regular expression library for Common Lisp
  7. Reactive
    CL-REACTIVE - Reactive programming at the variable/function level for Common Lisp qooxlisp - Qooxlisp is a reactive rich web applications framework based on Qooxdoo built on the cells library with which its author built an online algebra learning system and sees continuation in MatrixJS / cljs
  8. read-csv
    Read-csv is a library for reading csv (comma-separated-values) files
  9. READ-DELIMITED
    READ-DELIMITED (proposed by Jochen Schmidt) is a member of the Common Lisp Utilities family of programs, designed by community consensus
  10. read-macros
    read-macros is a convenience library of useful read macros for CL