You can get more information from the ac6-tools website and download (registration required) various documents highlighting:
System Workbench for STM32
This forum is meant to discuss problems and suggestions on System Workbench for STM32.
Failed to execute MI command: target remote localhost: 3333 by DSIN
This low-traffic forum will receive announcements from Ac6 about the OpenSTM32 site or Ac6 STM32 development tools.
System Workbench for STM32 v2.9.1 release by christelle.burguera