I'm interested what fdej thinks about this one. arb has recently been merged with flint under his maintainership and is getting some generic rings wrapper and more interfaces with other languages. But maybe its focus is more like algebraic things like modular forms and less like tensor libraries for machine learning and GPGPU.
https://news.ycombinator.com/user?id=fdej
https://news.ycombinator.com/item?id=26054520
https://arblib.org/