MetaX (
https://metax.io/) - AdChain
AdEx (
http://adex.network/) - ADX
Brave (
https://basicattentiontoken.org/index/) - BAT
Qchain (
https://qchain.co/) - EQC / XQC
Papyrus (
https://papyrus.global/) - PRP
KR8OS (
https://kr8os.com) - MAT
MetaX is already past it's ICO but I haven't seen much coming out of their pipeline. Looks like they're trying to bring all of advertising to the blockchain.
AdEx also seems like they are bringing all of advertising to the blockchain/
Brave - a browser that limits ads or displays more relevant ads to you. I like the idea of having less random ads, but I don't think I'll be moving to a new browser anytime soon/
Qchain - ICO just started, but ultimately similar to MetaX and AdEx.
Papyrus - Russia based but also similar to Qchain to MetaX and AdEx.
KR8OS - This is the interesting one I'm looking into. They're not trying to bring the entire industry to the blockchain, rather they're building a solution that can bridge the two together. It looks like they're focusing on resolving attribution fraud for now, hopefully they can extend more to general adfraud in the future.
Thoughts? Please note I work for KR8OS.
Edit: Their ANN is here:
https://bitcointalk.org/index.php?topic=2322677