GMaps makes adding and customizing Google Maps a breeze. Aside of adding a map, you can also a couple of things into the map, such as polylines which may be useful for drawing a route, a special menu control, and even HTML elements.
GMaps is compatible with JSON formatted data which you can utilize to integrate your map with a particular app, like Foursquare.
With jHERE, you can easily add interactive maps to your website. In only 5KB (2KB Gzipped), you get a powerful map API, highly customizable markers, event handling and info bubbles. Bonus features areKML support and data visualization via heatmaps.
Kartograph is a simple and lightweight framework for building interactive map applications without Google Maps or any other mapping service. It was created with the needs of designers and data journalists in mind.
A geochart is rendered within the browser using SVG or VML. Note that the geochart is not scrollable or draggable, and it’s a line drawing rather than a terrain map; if you want any of that, consider a map visualization instead.