Lucky for you, it can be self hosted, too! Make sure to use BrainX Revamped, the original BrainX is already deprecated and had lots of bugs. beRAIN tried to continue the original and had a working prototype without using two hemispheres, but it sadly didn’t take off and is not maintained. There are more forks of original BX and BXR, so choose your flavor, but beware of the cloud one by Oracle that was forked before the license change and made closed source.