Supported developpement environments (at least):
* Arduino: https://www.electronics-lab.com/getting-started-with-espressifs-esp32-c3-devkitm-1-on-arduino-ide/
* Espressif ESP-IDF: Made a tutorial: https://popolon.org/gblog3/?p=1881 (FreeRTOS)
* Apache NuttX Made a tutorial: https://popolon.org/gblog3/?p=1977

ESP32 RISC-V simulator:
https://codeberg.org/vak/esp32-riscv-sim

ESP-IDF can be tested on Juice Vm RISC-V emulator:
https://github.com/juiceRv/JuiceVm

Some branchs of Qemu for ESP32 allow to test ESP-IDF on Tencilia (Xtensa ISA, not RISC-V ISA) emulation of ESP32, can e useful for pure-c dev, without assembly code
https://github.com/Ebiroll/qemu_esp32

Archive of github SSD1306 driver for I²C OLED screens
https://github.com/nopnop2002/esp-idf-ssd1306