

I work as a tutor at a university, helping students with mathematics. Lately, I've been compiling some notes into a study guide. I'm using Mathtype for the math notation. But, I was wondering if anyone knew of a piece of a software I'd be able to use to make diagrams of the quality I see in math textbooks. For example, I'd like to be able to easily make a counting tree (or a probability tree). For the linear algebra course I'd like to be able to construct diagrams involving planes, lines and vectors.

Looking for software recommendations to make math diagrams for a study guide for my students.