I like to use OpenRGB to monitor operating temperature. The CPU fan reads the CPU temp, the window in front of my graphics card reads the GPU temp, and, for now, I have my keyboard reading the NVMe temp (just recently installed the NVMe). My mouse color is set by Piper/libratbag so I know what preset I’m using.
For controlling addressable RGB lights. The Hardware Sync plugin allows you to use various PC status inputs to set the light colors