V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IPSE
       Integrated Programming Support Environment (CASE)


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

Integrated Project Support Environment
IPSE

    (IPSE) A set of management and technical tools to
   support software development, usually integrated in a coherent
   framework, equivalent to a Software Engineering Environment.

   (1999-04-26)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

IPSE. He, himself; the very man.