GMap.NET is an open source, cross-platform library for developing advanced mapping applications. It provides powerful tools for developers to create interactive, custom mapping applications using the latest data sources and technologies. With GMap.NET, developers can easily integrate powerful mapping capabilities into their applications, allowing users to explore, visualize and analyze data from a range of sources, including OpenStreetMap, Bing Maps, Google Maps, and more. GMap.NET also provides access to an extensive set of APIs, including WMS, Geocoding, and Geofencing. GMap.NET also offers a range of features such as custom map layers, geocoding, routing, and heatmaps. Additionally, GMap.NET is customizable, allowing developers to adjust the look and feel of their map applications.
It is not similar at all. Google Maps is not an SDK