1. enhanced-defclass
    enhanced-defclass provides a truly extensible version of DEFCLASS that can accurately control the expansion according to the metaclass and automatically detect the suitable metaclass by analyzing the DEFCLASS form
  2. enhanced-eval-when
    enhanced-eval-when provides an enhanced eval-when macro that supports (eval-when t ...) as a shorthand for (eval-when (:compile-toplevel :load-toplevel :execute) ...), addressing concerns about verbosity
  3. enhanced-find-class
    enhanced-find-class provides a canonical way of converting class designators to classes
  4. enhanced-multiple-value-bind
    enhanced-multiple-value-bind provides an enhanced multiple-value-bind macro that adds support for lambda list keywords by expanding to a multiple-value-call when necessary
  5. enhanced-typep
    enhanced-typep obsoletes all TYPEP thin wrappers
  6. enhanced-unwind-protect
    enhanced-unwind-protect provides an enhanced unwind-protect that makes it easy to detect whether the protected form performed a non-local exit or returned normally
  7. Eos
    Eos is an obsolete fork of FiveAM developed by Adlai Chandrasekhar
  8. Epilog System and Episodic Logic
    In contrast to Epilog Inference Package, the original Epilog system was created by Schubert, Hwang and Schaeffer for knowledge representation in Natural Language Processing, and is documented at the University of Rochester's Web
  9. Epsilon
    This library provides SBCL with monolithic library support necessary to securely build, load and distribute binary packages
  10. EQL
    EQL is Embedded Qt Lisp, a Qt4/Qt5 GUI library binding embedded in ECL