Have a look at draw.io (https://about.draw.io/features/ https://about.draw.io/features/) which can make a lot of fantastic diagrams. Be sure to look at the "Mor

Have a look at draw.io (https://about.draw.io/features/ https://about.draw.io/features/) which can make a lot of fantastic diagrams. Be sure to look at the "More shapes..." options and choose the libraries that are of interest to you. Free and open-source.