https://github.com/khimaros/flow if you're looking for a more streamlined and minimalist alternative to n8n. it also has CLI integration with piped input and output. user nodes can be written in Typescript, Python, and Rhai in addition to fully declarative nodes. UX it's more similar to ComfyUI
Node-RED is also a good alternative, especially the new version 5 (for those who might have tried it before and didn’t like the editor).