Node-bitcoin-explorer is a project mainly written in ..., it's free.
A Block Explorer clone built using node-bitcoin-p2p
This is mostly intended as a demo application for node-bitcoin-p2p. It replicates most of the functionality of the popular Block Explorer website.
npm install bitcoin-p2p
npm install express
git clone git://github.com/justmoon/node-bitcoin-explorer.gitTo start the server
node app.jsThe application will be visible on http://localhost:3000/