This looks similar

https://github.com/dgorissen/pycel

or perhaps

https://github.com/xuri/efp

Will be, "soon". It turns out it's difficult to get the basics of a spreadsheet right. I made the mistake of trying to use an existing spreadsheet application (like LibreOffice Calc or Excel) as the source format early on.

Have you seen Treesheets, http://strlen.com/treesheets/?

That's quite cool, thanks for the link. Tables seem to be a more popular model for finance and similar, but it's always interesting to see new data models like this.

This could allow for more interesting things like gathering fields from records into a meta-table from a relational DB, that would definitely be a valuable next step.

Was minorly obsessed with this a couple of years ago. Is very interesting but ultimately lacks a lot that could make it useful

Out of curiosity, what's missing from it ? I've been meaning to use it but still haven't found actual uses, I'd love to see what others do with it.

Mathematical functions, easy formatting, and more anything a purpose. Basically it does thinga you don't want a spreadsheet to do. It's more akin to a mind mapper and there are easier to use tools for that.

It’s a good foundation for future open-source development, uses wxWidgets toolkit for cross-platform desktops. Author has graphics background, now busy at BigCo.

Is there a github or similar I can watch?

After seeing the level of interest here, I set up a (tentative) github org where I'll put the repo for the evaluator when it has some reasonable subset of the desired functionality.

https://github.com/exorgan