This gem allows you to specify multiple database files in rails. If you need some model to use a different database file, just write self.config_file = 'other_file'.
Shadabahmed.com is running on a fully open source personal profile and blogging engine. It's coded in Ruby on Rails 3.2. You can simply add content filler like a CMS or modify the source code by forking from my project.
A Gem for awesome rails logging. Your logs will be searchable from a beautiful web interface.