This is a simple cashier system that we wrote for and used successfully on an event with about a thousand visitors.
It allows to easily validate tickets that have been sold before and keeps track of the number of visitors that have checked in over the course of the day.
To get all the dependencies (and probably some more) installed run:
bundle install
Create the sqlite database:
rake db:migrate
Create some test data to get started:
rake KassaBlanca:add_fake_data
Start the application:
rails server