Tree Sheets is a two-dimensional note taking software, a nested spreadsheet. It reminds me of [[mini cubes]].

I tried it out, it is nice. It uses an opaque format, so it seems, but whatever.

=> https://strlen.com/treesheets/ img { https://strlen.com/treesheets/docs/images/screenshots/screenshot_todo.png }

It's like a spreadsheet, immediately familiar, but much more suitable for complex data because it's hierarchical. It's like a mind mapper, but more organized and compact. It's like an outliner, but in more than one dimension. It's like a text editor, but with structure.

=> https://github.com/aardappel/treesheets ZLIB license