TeXCAD

TeXCAD is a program for drawing or retouching {picture}s in LaTeX. The features of environment {picture} are quite limited, but it presents the great advantage of requiring no add-on and being displayed on all devices. You also enjoy the same fonts, macros, formulas as elsewhere in your LaTeX document. In addition, TeXCAD extends the original {picture} capabilities, even without any obligatory LaTeX package, class or style sheet. Furthermore, you can still switch on some supported add-ons, but are not obliged to.