Someone just posted an open-source alternative earlier today. Its UI looks better too.
https://news.ycombinator.com/item?id=50427934
I don't see Ultorg's nested results in their screenshots, which is really what makes Ultorg special.
There's also this https://mathesar.cloud/
From the looks of it, that is just the performance part of it. Ultorg is so much more.
I don't see Ultorg's nested results in their screenshots, which is really what makes Ultorg special.