UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
Notion Web Clipper - Capture and organize any page on the web to Notion 📝
draw.io - Online diagramming application
Powersave Pro - Save ASAP to anywhere. Save more, categorize & analyze as you browse.
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.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.