CANtact - opensource USB-CAN adapter project make cantact-16
CANable - opensource USB-CAN adapter based on CANtact project make canable
Entreé - opensource USB-C CAN adapter based on CANable project make entree
Any other STM32F042 based boards with external or internal OSC.
Toolchain
GNU Arm Embedded Toolchain
License
WTFPL
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.