You will find at http://www.couleur.org/ a nice freeware tool wich can visualize in 2D/3D different color spaces. If you ever wanted to create your own color-wheel or know why vectorscopes from different color grading softwares set R/Mg/B/Cy/G/Yl color points differently - you could visualize the answer quickly as they might work with different color spaces. Can visualize 3D color spaces like Lab, YUV, YCbCr, etc.
This is a quick comparison of chroma part of analog YUV and digital YCbCr.
In which space works Sony Vegas Pro / Davinci Resolve / Final Cut Pro / Color Finesse / Premiere Pro etc. with their colorwheels and vectorscopes ???
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