The NetBSD port for DEC’s RISC-based “Alpha” architecture. Currently still supported.
The NetBSD port for the arm64 architecture. Runs on a bunch of boards and things.
The NetBSD port for the armv7 architecture. Runs on a bunch of boards and things.
The OpenBSD port to the i386 architecture.
The OpenBSD port to the octeon architecture, which has various network-based hardware and similar MIPS-based devices.