NATO.0+55+3d was a software application for realtime video and graphics, released by 0f0003 Maschinenkunst and the Netochka Nezvanova collective in 1999 for the classic Mac OS operating system.

Being one of the earliest applications to allow realtime video manipulation and display, it was used by artists for a large variety of purposes, prominently for live performance, VJing[1] and interactive installation.

Running in the framework of Max (a visual programming interface for rapid prototyping and developing of audio software), NATO.0+55+3d extended Max by allowing to access and manipulate all the media types that QuickTime supports (films, images, 3D models, QuickTime VR, etc.).

Earlier software such as Image/ine developed in 1997 at STEIM was drawing in a similar direction,[4] but the fact that NATO.0+55+3d was operating inside the Max/MSP framework, using its "visual programming" protocol, provided at the same time greater ease of use and more flexibility,[5] allowing the user to create their own applications and tools.

The flexibility of the interface provided artists with "a uniquely suitable environment for the creation of new synesthesiac applications and experiences" (Meta 2001) and "opened up tremendous possibillities for working with realtime video" (Gilje 2005).