Adshares is developing a blockchain-based platform for programmatic advertising. They're goal is to create a decentralized marketplace to connect publishers and advertisers. Their advertising platform is based on their own blockchain, which is called the Enterprise Service Chain. It has a dPoS consensus mechanism and is powered by the native ADS coin.

AdEx is a decentralized advertising exchange built on the Ethereum blockchain. They hope to use blockchain to improve privacy, transparency, and security for viewers, publishers, and advertisers. The network is powered by the ADX token.

ClearCoin is developing a smart contract based advertising and media buying platform, built on Ethereum. Powered by the XCLR token, ClearCoin connects advertisers and publishers in a media buying network that uses blockchain to add efficiency and transparency to the media buying process.