From the press release:

Boulder, Colorado – August 17, 2006 ITT Visual Information Solutions, a wholly owned subsidiary of ITT Corporation (NYSE: ITT), today announced it has reached an agreement with Visual Numerics, Inc. to integrate the IMSL C Numerical Library into its data visualization and analysis product, IDL. The selection of the IMSL Library will allow ITT to provide the industry-leading collection of mathematical and statistical functions to IDL users in a wide variety of scientific and engineering disciplines.

Cool. Here is a list of IMSL library features.

ITT Visual Information Solutions Announces Selection of IMSL Library for IDL