1. gSpatial Toolbar is a standalone application allowing you to import ESRI shapefile data to Google Earth™. ESRI shapefiles are a very common GIS (Geographical Information Systems) binary file exchange format. 

2. The gSpatial .NET library is a set of Microsoft .NET libraries and controls that are intended for use by developers who use the .NET family of programming languages and require the ability to embed GIS and mapping functionality in their applications. It exposes a .NET library of mapping objects and functionality, as well as implementing a Web Map Server and Web Feature Service servers for use in web applications.