There was Joost in 2008, from Skype founders. Skype was originally P2P until Microsoft acquisition and killing this legally questionable feature - need to feed the big brother (:
Joost raised ~$50M.
I remember it as it was one of rare apps built in XUL, the same framework as Mozilla apps (Firefox).
PriitK of Joost/Sykpe was also involved in the original Kazza. I've told previous stories of his involvement in a 1990s MMO spaceship game, where he recreated the original buggy/cheat-filled client (Subspace) and released the now standard replacement (Continuum).
Came to share this too. I used Joost at this time. Got me into watching the world poker tour on the platform and into playing poker and watching other live poker.
I remember it as it was one of rare apps built in XUL, the same framework as Mozilla apps (Firefox).
https://en.m.wikipedia.org/wiki/Joost