While in some ways quite different from Mongo, it's also used for many of the same purposes. Hence my comment, and hence the article I referenced. The goal of

While in some ways quite different from Mongo, it's also used for many of the same purposes. Hence my comment, and hence the article I referenced. The goal of my comment, btw, was to provide some context for the top link, which didn't really describe what the product was; I didn't intend to have anyone think I was disparaging either product. OrientDB can do some things that Mongo cannot (as you mention, SQL access, and the great linking), but when I have seen Orient used, it's in an almost interchangeable way to how one would use Mongo (ie, folks not using the linking and leveraging the SQL just to ease querying). So, variant may not be the right word, but it's an open source NoSQL document oriented datastore, like Mongo, with the additional features you refer to which, for some use cases, make it a superior offering.