Holy fuck
You can download Eclipse 2019-12 and install the AC6 tools yourself:
https://www.openstm32.org/tiki-view_forum_thread.php?comments_parentId=8242&forumId=7
Related content
Development tools for Zephyr on STM32
Workbench 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.