Microsoft Visio

draw.io

draw.io (also known as diagrams.net) is a free diagramming application used for flowcharts, network diagrams, wireframes, and technical documentation, with a strong emphasis on privacy and self-managed data storage. It is available as a browser app at app.diagrams.net and as a desktop application, and it deliberately maintains long-term backward compatibility with older diagram files.

yEd Graph Editor

yEd is a free desktop diagramming application from yWorks for creating, editing, and analyzing diagrams. Rather than requiring every node to be placed by hand, it can import structured data directly from Excel spreadsheets or XML/GraphML files and use automatic layout algorithms, built on yWorks' commercial yFiles diagramming library, to arrange even large and complex graphs cleanly. It covers a wide range of diagram types including flowcharts, BPMN process diagrams, UML class diagrams, organization charts, and network topologies, and it exports finished diagrams to PNG, JPG, SVG, PDF, or SWF. Built as a cross-platform Java application, yEd runs offline on Windows, macOS, and Linux and is free for both personal and commercial use, making it a common choice for engineers, analysts, and IT teams working with data-driven diagrams.

Lucidchart

Lucidchart is a web-based diagramming application for creating flowcharts, org charts, wireframes, and technical/network diagrams. It offers real-time collaboration and integrations into Microsoft and Google workspaces, making it a powerful tool for teams and individuals alike.

Excalidraw

Excalidraw is a free, open-source collaborative whiteboard tool that allows users to create and share diagrams, flowcharts, and other visual content in real-time. It is designed to be simple, intuitive, and highly customizable, making it a popular choice for teams and individuals looking for a flexible and collaborative drawing tool.