#UML Tool
Draw.io
Draw.io is a powerful and completely free online diagramming tool that supports creating various professional diagrams such as flowcharts, mind maps, network topology diagrams, and UML diagrams. No installation is required—use it directly in your browser, making it an ideal alternative to Visio.
pgModeler
pgModeler is a powerful open-source PostgreSQL database modeling tool that supports intuitive visual design and UML diagram creation, serving as an efficient assistant for developers and data analysts to quickly design and manage complex databases.
ProcessOn
ProcessOn is a professional online tool for creating mind maps and flowcharts, supporting various diagram types including flowcharts, mind maps, prototypes, and UML. It offers real-time collaboration features, making it ideal for team project management and personal knowledge organization.