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.
one more thing... about the STM32CubeMX. How to use the file generated by the tool with SystemWorkbench is an interesting topics. IT is what I usually do. Maybe we can open another thread in this forum in order to discuss about it.