Is there an open source alternative to Figma Weave?

Yes. Figma Weave (formerly Weavy, acquired by Figma in October 2025) is closed source, hosted only, and billed in its own AI credits. NodeTool covers the same kind of media work as an AGPL-3.0 open-source workspace: image, video, audio, and text on one canvas, run with your own keys at provider prices, as a desktop app, in the browser, or on your own server.