Very simple ruby script for offline creation of a private key for bitcoin brainwallets.
usage example:
./brainwallet.rb
You will be asked for the password. The output is e.g.
Enter password: correct horse battery staple
password: [correct horse battery staple]
private key: [5KJvsngHeMpm884wtkJNzQGaCErckhHJBGFsvd3VyK5qMZXj3hS]