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Like the STM32 blue pill there is a STM32F030F4P6 based blue board which so far as I know doesnt have a cool name yet.
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Do check David Welch' repositories, like this one for the blue pill https://github.com/dwelch67/blue_pill_too
You can download the generic CMSIS files from here. The device-specific CMSIS header files can be downloaded from the Keil website: MDK5 Software Packs. Those pack files are ZIP files, btw.
Here is a guide to porting an STM32 project from CubeIDE to VSCode and CMake. All credit to MaJerle.
I highly suggest https://github.com/ObKo/stm32-cmake Using cmake allows to build using cli commands. If you then onboard people later on, they still can work with their IDE thanks to cmake.
Or try RIOT-OS. Which is programmed in C and works nicely with STM32. It has some nice abstractions you can study. https://riot-os.org
Here's a repo I've made for my students https://gitlab.com/matsievskiysv/stm32_programming/. In it I start with assembly, introduce C and linker scripts and finally write my own HAL. It uses stock gcc, gdb and openocd from debian repo.