A rails3 unobtrusive in-place-editing plugin, using jQuery/jEditable.
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Enables easy display of items (taken from a Rails 3 model) with Google Map, OpenLayers, Bing or Mapquest. Geocoding + Directions included. Provides much options: markers customization, infowindows, auto-adjusted zoom, polylines, polygons, circles etc... See wiki for full description and examples.
Reputation system Rails engine.
An Active Record Reputation System for Rails
Provides a simple way to add rating functionality to your application. This fork adds unobtrusive javascript and uses jquery instead of prototype.