Active Invoices is a very simple Ruby on Rails invoicing application, built using the amazing active_admin gem.
Clone the repository:
git clone https://github.com/ianmurrays/active_invoices
And run the following commands:
bundle install
rake db:schema:load # or you can run rake db:migrate
You're going to need to create a user on the database using irb:
rails console
>> AdminUser.create! :email => "[email protected]", :password => "admin", :password_confirmation => "admin"
Now, run rails server and point your server to http://localhost:3000 and try out your new installation.