Balthazar project aims to create an open source 13.3 inch laptop that can use RISC-V, ARM, or FPGA processors thanks to a modular design based on the EOMA68 projects. Under development since 2019, it's not available yet, but work is progressing. https://www.cnx-software.com/2023/02/10/balthazar-an-open-source-hardware-modular-risc-v-arm-or-fpga-laptop/