Blockchair is a blockchain search and analytics engine for Bitcoin and Bitcoin Cash or you can also say it's a blockchain explorer on steroids. You can filter blocks, transactions, and outputs by over 60 different criteria, as well as perform full-text search over the blockchains.
We aim to become a Google for blockchains. Our next priorities are to support Ethereum and to create private APIs for traders which will make it possible for them to integrate blockchain analytics into trading algorithms. We also provide researchers with a way to batch export data from blockchains.
In November we launched Blockchair.Whitepapers – a search engine for whitepapers of blockchain projects which monitors all relevant blockchain projects including both cryptocurrencies and ICOs.