Truly minimal STM32G0xxFx development board by Vitaly Domnikov:

dotcypress/placebo

• Breadboard/Perfboard friendly
• Power line bypass capacitors
• Reset circuit
• Tag-Connect TC2030-CTX-NL programming connector
• Optional battery connector with LDO
• Resources:
  • Schematics
  • Gerber files
  • BOM

https://twitter.com/dotcypress/status/1418474083528806401