Its all about Ruby On Rails
API
Two best online API/Rails API
Nov 5th
Today I found two best API sites. One is http://www.gotapi.com.
This site provides APIs of almost all languages.
The other API site which is only focused on Rails is http://www.railsbrain.com/. I like this most. You can also download this API. It is AJAX based fast, useful.
Update: APIdoc is also very useful. You can get community help here.
Cartographer: A Google maps API in Rails
Jun 27th
If you want to insert google maps in your rails application, then you can use cartographer.
This is still in development.