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.
Which OS are we supposed to use then?
Ubuntu 16.04 is the oldest LTS that is still recommended by Ubuntu.
(Ubuntu 14.04 LTS reached end of life on April 30, 2019.)