Pencil is fantastic and I used it many times for visualizing architecture. It's one of the few good diagramming tools available on Linux. I think I've donated a

Pencil is fantastic and I used it many times for visualizing architecture. It's one of the few good diagramming tools available on Linux. I think I've donated a couple times to support them. That said, portability and collaboration are important to me which has drawn me to cloud solutions like draw.io.