- Embedded Office CANopen stack. Though it may have been abandoned by now. For example, “CANopen demo for STM32F7xx microcontrollers“.
- Raspberry Pi Pico / RP2040 PIO. Most likely, it is not a complete implementation (for example, all the error modes/states and handling)
- A Sigrok CAN decoder. Presented in an The Amp Hour in June 2023.