BTW when talking about RISCV there is also https://www.espressif.com/en/news/ESP32_C3 but not sure how much they improved power management, ESP32 is not exactly low power as expected for BLE devices.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
BTW when talking about RISCV there is also https://www.espressif.com/en/news/ESP32_C3 but not sure how much they improved power management, ESP32 is not exactly low power as expected for BLE devices.