draw.io / diagrams.net

draw.io, which transitioned its primary domain to diagrams.net in 2020, is a widely used security-first diagramming and whiteboarding tool. Originally developed to provide a high-quality, free, web-based alternative to expensive proprietary software like Microsoft Visio, the brand was built on the principle of data privacy, allowing users to store their files wherever they choose without lock-in.

The project is unique in its ownership and maintenance structure. While it is maintained by JGraph Ltd, a company based in the United Kingdom, it operates as an open-source project under the Apache 2.0 license. This means the software's production—in terms of coding and development—is a global collaborative effort. The brand remains highly popular through its integrations with Google Drive, OneDrive, and Atlassian Confluence, maintaining a position as a leading utility in the productivity software space.