Sketchboard

Sketchboard is an online collaborative whiteboard focused on software diagramming and technical sketching. It supports UML diagrams, flowcharts, mind maps, AWS architecture diagrams, and freeform sketching with a distinctive hand-drawn visual style. Shapes connect automatically and reroute when moved, and users can choose background modes including grid, dark, sepia, white, and paper. The tool is aimed at software developers and product teams brainstorming architecture, planning features, and documenting systems in real time. It offers a free tier alongside paid plans, with an infinite canvas supporting distributed team collaboration. Note that the domain recorded for this entry belongs to Cobalt, a separate penetration testing company, so the domain mapping should be corrected.