Heroku Open Source Plugins etc
YamlDb
YamlDb is a database-independent format for saving and restoring data, in the same way that schema.rb is a database-independent format for schema.
Install in Rails 2.1:
script/plugin install git://github.com/adamwiggins/yaml_db.git
In Rails 2.0 or below:
script/plugin install http://github.com/adamwiggins/yaml_db.git
If the above doesn't work for some reason, you can use the out-of-date svn repo:
script/plugin install http://opensource.heroku.com/svn/rails_plugins/yaml_db
Heroku Client Gem
Rubygem with a command-line interface for accessing the public API to create and manage Heroku apps.
gem install heroku
Send patches and feedback to the Heroku mailing list.