I think these are called "spanner" bits. The precision drivers from ifixit are pretty good if you need accuracy for working on computers, rc cars, robots, etc. But they're aluminum so not great for heavier jobs. I still use a ratcheting driver or a power tool for anything that requires some effort.
Example kit with spanner bits: https://www.ifixit.com/products/mako-driver-kit-64-precision-bits