Disclaimer: I don't want to minimize your achievement or be overly critical of the tool you've built. I've used a lot of relational database modeling tools in the past and what you've built looks perfectly capable for the job. But I clicked on your link hoping for something very different and didn't find it. So hopefully others can point me in the right direction if what I am looking for exists.

The crux of my disappointment stems from you having left out a word in the description of your tool. It's a Relational Database Diagramming tool...the Relational aspect of it making it significantly less useful for me. I've worked with Relational databases for close to 30 years and I find that I'm able to design schemas in my head without the need for a tool. On occasion, a tool that's able to reverse engineer a visualization of the model from the schema can be useful in quickly coming up to speed on an existing schema, but even that isn't essential.

Where I think tools would really help me is in designing for non-relational databases. It's a harder problem, since those databases are often schemaless, but that would make a design tool all the more useful, since those designs could act as documentation that's often unnecessary in the relational world where the schema is readily available.

So can anyone point me towards a visual design tool for non-relational databases, document, kv or otherwise?