Graphe Easy is a feature-rich yet easy-to-use 2d-graph plotting wind0ws program. It allows you to draw many graph types (cartesian, polar, parametric coordinates) and many other graphs such as conics, integrals, inequations or sequences. It also provides a wide range of tools to comment on the graphics and get high quality results. If you are not familiar with it or do not have the latest version, just download it to have a try. 

hxxp://www.grapheeasy.com/index2.php?lang=en