Devoxx Badges app for iPhone and iPad
This is the Devoxx conference companion app for keeping track of the people you meet at Devoxx. Ideally suited for sponsors, but usable by any attendee.
No login required, just launch the app and scan another attendees badge, optionally enter a note and export your new contacts at the end of the conference.
Optionally you can also choose to identify yourself using an email address, so you can receive an export via email afterwards.