GraceGTK is an evolution of the grapher Grace. It is based on the GTK API with higher interactivity and new features such as a tree view of the drawing and contour levels curves. Create and edit graph with this tool.
You should be aware that the GUI size is configured too use at least a 17 inches screen. If yours is smaller you have to set GRACEGTK_GUI_SIZE environment variable to a convenient size.
Features:
1. Explorer (TreeView) popup
2. Toolbar buttons
3. Ellipse object is replaced by the more general Arc
4. Spline and interpolation
5. Follow me mode
6. The "layers" feature
7. The color map and contour type of set

The license of this software is Free, you can free download and free use this graphing software.