nodeDHT:
A DHT crawler, written in Node.js, the code is very very simple.
dependencies:
npm install
start nodeDHT
node nodeDHT.js
notice:
You can edit NODES_MAX_SIZE value for speed.
nodeDHT for Python and Ruby
p2pspider
You may be interested in p2pspider(DHT Spider + BT Client = P2P Spider).