I find IPE to be a life-savior when it comes to generating physics illustrations which come with their share of math toppings. The editor has nice utilities for latching on to the boundaries, intersection, center etc of geometric figures. The spline tool is the best I have seen anywhere. Layers are handled with grace. LaTeX is rendered instantly. It is very easy to produce a multipage document. What more can one possibly want?
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
YouiDraw - Draw and Design Vector Graphics, Logo, Text, icon in the Cloud.
PGF and TikZ - PGF/TikZ is a tandem of languages for producing vector graphics from a geometric/algebraic...
Aphalina Designer - Download this app from Microsoft Store for Windows 10, Windows 10 Team (Surface Hub). See screenshots, read the latest customer reviews, and compare ratings for Aphalina Designer.
draw.io - Online diagramming application
formo.one - Create generative art from any kind of photo