Since the title was getting long we couldn't quite fit in that it's also open source, and that it's written in Zig. But it is, and it is. :)
https://github.com/tigerbeetledb/tigerbeetle
Also, if there are any Africa-based devs here (but of course, you're welcome to come from wherever you are) we're running a systems programming conference with Derek Collison of NATS, Jamie Brandon of TigerBeetle and HYTRADBOI, Andrew Kelley of Zig, and many other great folks.
Next week, Feb 9th and 10th in Cape Town. Maybe we'll see you there!