UPDATE: October 4th, 2018
Capture One Styles from Phase One on their website. These are quite good and different than the 1styles.pro and C1styles.com presets.
I removed a couple of older links to presets/styles that I feel are supplemented by newer options that feel more current to how people shoot.
CAPTURE ONE PRESETS - FREE
CAPTURE ONE PRESETS - Purchase
1Styles.pro (These are excellent!)
https://imagealchemist.net/capture-one-presets/ (Exceptional set!)