CircuiTikZ TeX/LaTeX package for drawing circuits
A handwriting notetaking software with PDF annotation support
PyAMS (Python for Analog and Mixed Signals) CAD approach
svg editor: Easily create documents for math, physics, chemistry...
UCanCode Visio 2023, the best replace of Microsoft Visio
Free CAD software
Simple and intuitive 2D vector drawing for electronics and not only.
Drawing robot for electrical interconnection diagrams in DXF.