Gradgrind
Gradgrind is a palette generator which takes particular care to create smooth blends between colours. The palettes are generated by curve-fitting rather than linear interpolation (using Catmull-Rom splines, if you’re interested), and can be created and saved as script files as well as edited interactively.
It can create greyscale palettes, which can be particularly useful when loaded into PhotoDesk and used as displacement maps or effect gradients. PhotoDesk can only generate linear blends, which can give visible artefacts, discontinuities and banding.
The program comes with full documentation and example gradient scripts.
Gradgrind is a RISC OS program. It will not run under any other OS.
This is a beta version, 0.90. It was written and developed under RISC OS 5.31. Prior versions of the OS may work; feedback is appreciated.
Download link: Gradgrind 0.90 beta (325k)