Figma Map Maker - Figma plugin to generate map, supporting Google Maps, Mapbox
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Figma Super Tidy - Figma plugin to easily align, rename and reorder your frames
draw.io - Online diagramming application
Easometric Figma Plugin - With Easometric it's really easy to create isometric layers.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.