Another worthy mention would be Affilae (a 100% pure bootstrapped startup - no incubators, no accelerators, no funds raised and yet already profitable). It's B2B and not B2C though so perhaps not usually featured on these types of lists. ;)
It's a white-label SaaS affiliate and performance marketing platform providing tracking, attribution and analytics for running performance marketing networks and campaigns in-house.
https://affilae.com
It's a white-label SaaS affiliate and performance marketing platform providing tracking, attribution and analytics for running performance marketing networks and campaigns in-house.