Here’s another brand color reference guide.
I cant find much info about this site, but it has a good amount of Pantone colors for different brands. Some brands like Slack, have specific color source pages referenced. Others, (like the Ninja Turtles) have the phrase “nearest match” to denote they aren’t listed by the brand specifically but a subjective closest match.
The colors come listed in blocks. They are broken down by Pantones, Hex, RGB, as well as CMYK.