BlockSeer

Bitcoin Block Explorer is an open source web tool that allows you to view information about the blocks, addresses, and transactions created by Bitcoin.

Blockchain explorer with a color-coded interface to perform fine-grained transaction analysis. Includes a mining simulator.

OmniExplorer is a Block Explorer for the Omni protocol which is created and maintained by the Omni Foundation. It allows you to query address balances and transaction data on the Omni protocol. Over time additional statistics, information, tools may be added to assist the community.

Blockchain Demo is a visual explanation of the blockchain.