I'm aware that Decisive is transparent when it comes to the placements you are buying and they have a big list of placements that can be downloaded.
I've also heard that PocketMath has a large list, but unfortunately they seem pretty strict when it comes to accepting affiliates.
Do you guys know of any other traffic sources that show lists of placements on exchanges?
Sitescout and Adform also have full transparancy about where you are running (on a specific site level). Most exchanges are pretty open about this, you can also ask your account manager to send over a site list. What do you want to get out of this +1000 names-list?