You might be interested in the Baochip https://www.crowdsupply.com/baochip/dabao/updates/our-campaign-has-launched https://www.crowdsupply.com/baochip/dabao/up

You might be interested in the Baochip https://www.crowdsupply.com/baochip/dabao/updates/our-campaign-has-launched https://www.crowdsupply.com/baochip/dabao/updates/our-campai... Probably the most open chip on the market, and sits between a pi and a pico