J.J. Green
Diverging gradients which are continuous except at the centre-point, for emphasis of the sign of the data. Here the colour-stops are taken from the diverging schemes by Cynthia Brewer.
BrBG
PRGn
PiYG
PuOr
RdBu
RdGy
RdYlBu
RdYlGn
Spectral
Licence is Apache-like: See details and XML record.