How can I browse mempool in Ethereum? Is it possible from EthereumJ or on some websites?
To me, etherchain is more accurate to show the pending transactions. https://www.etherchain.org/txs/pending.
It is possible to get the pending transaction in JSON through the following get request: https://www.etherchain.org/txs/data?draw=1&start=0&length=100
New answer September 2020
A cool new tool was released: https://explorer.blocknative.com
Another visualisation, why breakdown into gas price ranges. Displays total gas costs and count of pending transactions.
Check out this guide from QuikNode on how to access the Ethereum mempool: https://www.quiknode.io/guides/defi/how-to-access-ethereum-mempool