I developed EstPoker that is an APP to help a small team do estimation. Planning Poker is a good tool but how to do planning without paper-made planning Poker. I think mobile APP would be a good replacement. EstPoker is a very simple tool and it can support a team work without any network connection. Estimators only chose his/her card on the same iPhone through hand this iPhone around all members.
of cause not. I think Product Owner and Scrum Master would be the organizer of planning meeting. When your team use EstPoker, and hand iPhone one by one. It is very funny just like a game in our childhood.