STM32Cube MCU Full Package for the STM32F3 series - (HAL + LL Drivers, CMSIS Core, CMSIS Device, MW libraries plus a set of Projects running on all boards provided by ST (Nucleo, Evaluation and Discovery Kits))
Why do you think that https://github.com/STMicroelectronics/STM32CubeH7 is a good alternative to STM32CubeF3