Brendon Muir

acts_as_list. An ActiveRecord plugin for managing lists.

ranked-model. An acts_as_sortable/acts_as_list replacement built for Rails 4+

positioning. Simple positioning for Active Record models.

canonix. OBSOLETE: An XML Canonicaliser to replace the abandoned ones.

switcharoo. An example of live database creation and switching

simple_form. Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

activerecord-tableless-models. Bringing together the different tableless model implementations into a single gem/plugin

juggernaut_gem. Realtime Rails