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.
When you use the ST-Link to program an off-board MCU (i.e., without a dedicated reset line attached), you have to override the default reset configuration to "none".