This featured program comes from Pappa Lapub.
Here's a small WavelengthToRGB converter that does just what it's name says, with different linear functions for R, G and B like this:
ID: RCP237 (Right click in GW for Help)
Also featured in the Small Basic Forum on MSDN here: https://social.msdn.microsoft.com/Forums/en-US/ca8db35c-abc7-4a9f-9e92-a1e4ae7c4ea4/colors-shapes-and-brushes?forum=smallbasic
Enter in the Import code to run it!
This program requires the LitDev extension.
As a bonus, here are a few more programs that Pappa Lapub developed (more info about them coming later):
Small and Basically yours,
- Ninja Ed