Leaflet
See the following -
An Open Source Mapping Primer
As you've surfed the web, you've surely come across many sites using embedded maps to display data. Humans are visual creatures, so presenting temperatures, crime statistics, or population densities on a map often makes quickly discerning patterns and spatial relationships easier than presenting the same facts as a boring table. Visualizations based on maps can be quite sophisticated and even show patterns across time as well as space; Maps Mania is one blog showcasing many great examples of online maps. But displaying data on an embedded map doesn't need to be a complicated affair. You can do it using open source tools. In this post, I offer some tips for getting started doing this...
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What Can You do with Open Data?
Play a word association game and the word "open" will almost surely be followed by "source." And open source is certainly an important force for preserving user freedoms and access to computing. However, code isn't the only form of openness that's important. Open data has been discussed for at least a decade. At the OSCON conference in 2007, Tim O'Reilly kicked off a bit of a ruckus when he suggested that open data might actually be more important than open code. Open data in this context mostly referred to the ability to export the user-created "Web 2.0" data, which was becoming important at that time. Tim Bray, then at Sun Microsystems, highlighted the issue when he wrote...
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