MapBox is a suite of open source mapping tools. The MapBox Android SDK can be used to create interactive map-driven applications for Android devices. It also allows users to host their maps so that they can be embedded on webpages and shared with a wider audience.
Micello is living my dream. This company is specializing in providing a navigation system for indoor environments. Indoor environments can be unpredictable and complex spaces. In other words they are the ideal scenario for maps. Micello has seen this opportunity and seized it by establishing a fast growing collection of indoor maps. The map collection is open for integration through both an embeddable HTML 5 element and RESTful calls to the Micello API.
Five years ago Paul Rademacher reverse engineered Google Maps to put Craigslist homes and rentals on a map on his site. The site essentially pre-launched the map mashup category, because there was no Google Maps API at the time. Now it is the prototypical example and still used by many to find their new homes. And, of course, Google Maps is now by far the most popular API to use.