The Free On-line Dictionary of Computing (30 December 2018):

Adaptable User Interface
Oracle Toolkit

    (AUI, Oracle Toolkit) A toolkit from Oracle
   allowing applications to be written which will be portable
   between different windowing systems.  AUI provides one call
   level interface along with a resource manager and editor
   across a range of "standard" GUIs, including Macintosh,
   Microsoft Windows and the X Window System.

   (1995-03-16)