Here’s how to let GDL read IDL .sav files.
Converting IDL code to Matlab isn’t entirely automated, but the idl2matlab program gives a good start.
Python is a high performance language for data analytics tasks common to science and engineering. Simple guide to transition from IDL to Python with examples.
How to compile and install latest GDL on Linux, free IDL 7 compatible
setup the legendary Astronomy library for IDL in GDL
Fix the GDL plotting error PLplot installation lacks the requested driver: xwin by installing plplot driver for X11.