alt Hacker NewsBuffalo shipped the WZR series routers with DD-WRT. But they stopped making them when the FCC restricted router firmware about a decade ago.
I bought a pair of them at the time. Kept one (N600) until I needed a 'mesh' and sold it on eBay about four years ago. Replaced it with an Orbi system that doesn't need to phone home (not sure such things are still available in the consumer market).
The ones that I had came with Buffalo firmware but you could load DD-WRT on them through the web ui. To load OpenWrt you had to use tftp and catch it during boot.
I ended up adding support for the G300NH2 model for OpenWrt.