I am looking for a graphing/plotting program that is capable of making a 3D and/or contour plots. I usually use xmgrace, but it cannot handle 3D plots. I have a file that contains a lot of x, y, z ...

If you have any suggestions, add them in the comments. That way, the next time I do a search for "3d plot in plotly" I will find this post and the comments will be useful to me (in the future).