Gliffy

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.

Cacoo

Cacoo, made by Nulab, is an online diagramming tool for creating flowcharts, wireframes, network diagrams, and org charts with real-time collaboration built in. Multiple people can edit the same diagram simultaneously, with in-app video chat and commenting so teams can talk through a diagram without leaving the canvas. It integrates with tools teams already use, including Slack, Google Drive, Confluence, Microsoft Teams, and Adobe Creative Cloud, and offers enterprise options like SAML authentication and private server hosting. Cacoo reports over 4 million users worldwide, spanning project managers, software architects, and small business teams who need shared visual diagrams rather than static files.

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.

Creately

Creately is a visual collaboration and diagramming platform that combines an infinite canvas with data-linked visual apps, letting teams build flowcharts, org charts, mind maps, and wireframes while also tracking project data on the same board. It positions itself as covering the full path "from idea to execution" rather than just static diagramming.