I draw figures for my mathematical lecture notes using Inkscape
I've also read previous article about how the author manage to take lecture note using Vim+Latex (also posted on HN), and that's amazing how author managed to do that. But I'm thinking for people who does not know how to use Vim (arguingly high learning curve) and Latex  to take note, what options do they have to take note quickly (with Math symbols/layouts)?You can try out Mathcha[1] which is built to help people without knowing of Latex can easily write down Note (with rich Mathematics symbols/layouts) and it also provide basic Drawing and basic Function Plotting (The Drawing Part no way compare to Inkscape, but hey! you can type Math on Drawing on Mathcha) in single Editor.Please note that I don't want to tout and advertise Mathcha here, the point is to provide another option for people to try out (I will not say it will provide faster or more powerful than Vim+Latex)[1] Mathcha website: https://www.mathcha.io/Disclaimer: I'm creator of Mathcha.