cold-ether
This software seems to work - it's not very tested though!
Ethereum cold storage solution using nodejs
Installation:
npm install cold-ether -g
packagetx packages a raw unsigned ethereum transaction.
A local ethereum node with rpc enabled is used to set the transaction nonce.
newaccount creates a new ethereum account
sign signs a raw unsigned transaction
sendtransaction publishes a raw signed transaction.
A local ethereum node with rpc enabled is used to publish the transaction.