TeXCAD is a program for drawing or retouching {picture}s in LaTeX. It extends the original {picture} capabilities, even without any obligatory LaTeX package, class or style sheet. Core of TeXCAD is totally portable. A MS Windows version is available.
More information on... https://texcad.sourceforge.io/
Alire crate: https://alire.ada.dev/crates/texcad
Mirror: https://github.com/zertovitch/texcad
Vectronics is a way to share schematics. It makes quick svg images that can be displayed in a browser and reopened and reedited as a schematic. Hyperlinks can also be added to link to data sheets or source code. It is a simple xml based drawing program .