I've been experimenting with a fairly vibecoded Office 365..., but rooted in the world of vibe (an advanced Markdown reader which can do complex things like render charts and mermaid diagrams, see: https://sdocs.dev, https://sdocs.dev/#sec=charts, https://sdocs.dev/#sec=diagrams). Slides coming soon too... But this is very much a subsection of the full Office suite.

(Also discussed on HN here: https://news.ycombinator.com/item?id=47777633)