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FriendlyElec NanoPi R5S as PTP Grandmaster Clock with GNSS/GPS Discipline (2022)
Cheap, ubiquitous, and feature rich RK3568 SBC with PTP and PPS hardware support
LBoxLS1028A- This seems like a superior PTP focused product due to the 4-port TSN (Time Sensitive Networking) 1 Gbps switch, but this is hard to buy. ChangWang CW-6000 routers- There are many versions of these routers an they all come with i226 Ethernet controllers now that should work great for PTP and the CPU has tons of power relative to the other runners up. I’ve been using one of these (rev 05) integrated in to my workstation motherboard for well over years without issue on Arch Linux with the mainline kernel driver.
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