Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
I've got a try myself relying on Windows 7 32b and latest SystemWorkbench for STM32 release. No issue to me to get standard peripheral library firmware either for F1 serie (package is around 21Mb) or F4 serie (package is around 75Mb).