IDL: The Scientific Computing Environment.

IDL(R) is a complete, integrated computing environment for data analysis,
visualization, and application development. Over 20,000 users in
laboratories, universities, and corporate R&D facilities worldwide take
advantage of IDL's comprehensive capabilities for research and production
applications in a fraction of the time needed in traditional languages
like C or FORTRAN.

Everything most scientists and engineers need is included in IDL for one
price.  IDL features include: an array-based, 4th-generation language
(4GL) to quickly prototype new ideas, a powerful cross-platform toolkit
for developing MOTIF, Macintosh(R) OS, and Microsoft(R) Windows graphical 
user interfaces, Numerical Recipes(TM) mathematics and statistics routines
for high-performance number crunching, built-in gridding, and comprehensive
data display capabilities ranging from XY plots to volume visualization.
Complete support for the most recent versions of scientific data formats
such as HDF, CDF, and netCDF highlights Research Systems' commitment to
expanding the breadth of IDL to advance cutting-edge research.