Brimir 
Brimir is a simple helpdesk system that can be used to handle support requests via incoming email. Brimir is currently used in production at Ivaldi.
Installation
Brimir is a rather simple Ruby on Rails application. The only difficulty in setting things up is how to get incoming email to work. See the next section for details.
To install brimir you first have to create a database and modify the config file in config/database.yml to reflect the details.
Now install the required gems by running:
bundle install --without development:test
Next, load the database schema and some defaults:
rake db:migrate
Last thing left to do before logging in is making a user and adding some statuses. You can do this by running:
rails console
Status.create([ { name: 'Open', default: true }, { name: 'Closed' }, { name: 'Deleted' } ])
Priority.create([ { name: 'None', default: true }, { name: 'Low' }, { name: 'Medium' }, { name: 'High' } ])
u = User.new({ email: 'your@email.address', password: 'somepassword', password_confirmation: 'somepassword' }); u.agent = true; u.save!
Incoming email
Incoming emails can be posted to the tickets url. First make a script like this on your mailserver:
#!/bin/bash
exec curl --data-urlencode message@- https://yourbrimirurl.com/tickets
Save it in /etc/postfix/brimir.sh for example.
Next, create an alias in your /etc/aliases file like this:
brimir: "|/bin/bash /etc/postfix/brimir.sh"
Now sending an email to brimir@yourmailserver.com should start curl and post the email to your brimir installation.
License
Brimir is licensed under the GNU Affero General Public License Version 3.