WeatherSpark:

Here is a site that allows free interactive data graphics and downloadable data for a respectable fee. WeatherSpark allows users to use the services for a fee; that is $10 for two years’ worth of daily data from a weather station. Although for some people the site can overlooked as confusing and hard to understand, yet this site contain decades of historical data.

DataMarket:

Over the past five years since its inception, DataMarket has been concentrating more on selling its enterprise platform these days than on its initial mission as a public data service. However, data availability in this site is incomparable as it holds massive amount of data- divided by country, industry and topic.

Apart from all the data, the tools provided are really good. Tools range from slicing and changing data and visualization types to event searchers and marker addition to the charts. Another advantage is that users can create additional data sets after creating an initial visualization.

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