Google maps is one of the most famous API for developer to work with maps. I worked on several projects in the intelligent transportation systems domain, analysis traffic data. Dealing with Google maps was one of essential things. Sometimes, I had to quickly plot points on the maps that reflect specific segments on highways, for that reason I developed a very simple tool to plot markers on the map based on Latitude and Longitude data. I like to make it open source and available so anyone can work on it on fly.
or find the open code on github: