Shuttle FV24: the tiniest Pentium III motherboard. Might make an ITX build out of it. : r/vintagecomputing
Shuttle XPC SN41G Socket 462 DDR Motherboard FN41 at MicroDream.co.uk
Amazon.com: Shuttle XPC Slim DH410 Mini Barebone PC Intel H410 Support 65W Cometlake-s LGA1200 CPU No Ram No HDD/SSD No CPU No OS (Vesa Mount Included) : Everything Else
SHUTTLE DS20U XPC SLIM FANLESS, INDUSTRIAL, VESA MOUNT, BAREBONE PC - I3 10110U WITH DUAL GIGABIT LAN - Linkqage