>> For Spatial data:
> sp, maptools – Tools for loading and using spatial data including shapefiles.
> maps – Easy to use map polygons for plots.
> ggmap – Download street maps straight from Google maps and use them as a background in your ggplots.
>> For Time Series and Financial data:
>zoo – Provides the most popular format for saving time series objects in R.
>xts – Very flexible tools for manipulating time series data sets.
>quantmod – Tools for downloading financial data, plotting common charts, and doing technical analysis