TikZ

Tikz is a software program that helps people draw pictures. It is used a lot by people who need to make graphs, diagrams or flow charts. With Tikz, you can create diagrams very quickly, and it is very easy to use. It uses a drag-and-drop system - you can just drag a shape onto the drawing area and customize it however you want. You can also add text and colors to your diagrams, and get them looking exactly how you want them.