Excalidraw
Excalidraw draws in a deliberately hand-drawn style, and that is a feature rather than a limitation. A diagram that looks unfinished gets structural feedback; a polished one gets feedback about the font.
It is the right tool for workshops, RFCs and anything you want people to argue with.
#What it is good at
Workshops and whiteboarding, including remote ones.
Early architecture sketches, where the design is not settled.
Wireframes at the stage where the layout is the question.
#A few things that catch people out
Excalidraw renders in the browser, so anonymous readers see the stored image.
Its shape libraries are its own format and cannot be shared with draw.io.
It will not make a formal diagram look formal. That is the point, but it surprises people.
#Related
Learn one properly. Borrow the rest when you need them.
