Intercom on Product Management - The ultimate resource for aspiring product managers
Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
Product School - The global leader in product management training
Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...
The Product Management guide - A book on how to create and ship products that people love
Colorblind Web Page Filter - Enter a URL, and this tool will render it as someone with color blindness will see it.