Another case of less known but powerful tool - Allegro Graph.
An RDF triple store, with advanced security, and most importantly, on-line materialization and application of schemas/ontologies.
Re:Build your next app with a graph database
by fractallyte on Thursday July 09, 2020 @04:56PM
(#23785112)
There's also Gemstone, a proprietary Smalltalk object database (https://gemtalksystems.com/). You do all your coding within the database, so it really blurs the distinction between data and code.
Magma is a rather nice open source Smalltalk database (https://wiki.squeak.org/squeak/2665), available for Squeak and Pharo.
As the name suggest it's object oriented and queries return graphs of objects.
It's heavily multi-threaded and has been around since 1989 (iirc).
The only big downside (besides being proprietary) is that it's almost impossible to scale out (horizontally). But it scales enormously well vertically (throw resources at it and it will happily use it in a very efficient manner).