This looks really neat and powerful. I think spreadsheets have a lot of deficiencies and that many users abuse them, but that's because there is no widely known alternative/extension. For example, I wanted to create a list of data sources in a particular area. It doesn't warrant any coding, this is just a simple document, but doing it in a spreadsheet is too clunky: I want tags, paragraphs of text, and, crucially, a vertical "heading-tags-link-description" structure. In the end, I wrote a Markdown doc, but now I can't sort or filter! It looks like UltOrg could deal with this, even though it's probably not one of the main usecases. I wish Eirik the best of luck with the project.