The BeagleV offers open-source RISC-V computing on freeRTOS and Linux distributions like Debian and Fedora. With a SiFive U74 processor and up to 8 GB of RAM, the BeagleV should be a powerful single-board computer. The BeagleV has a plethora of I/O, too.
https://www.notebookcheck.net/BeagleV-A-powerful-RISC-V-single-board-computer-that-runs-Linux-from-US-119.516265.0.html