There’s a new bug report asking for the implementation of the “turbo” colormap (GNU Octave - Bugs: bug #59998, Add "turbo" colormap [Savannah]). The colormap is already included in Matlab (version 2020b). I looked at the C-language implementation and the file is copyrighted by Google with an Apache-2.0 license. Can we use that in Octave?
Actually, all one needs is the color coordinates, not the implementation in C. Is it okay to use those?