NetBSD/sbmips is a port of NetBSD to Broadcom's SiByte Broadband Processor.
NetBSD/sbmips-mipsel 6.1.5 via FTP
NetBSD/sbmips-mipseb 6.0 pre-built binary packages from pkgsrc
NetBSD/sbmips-mipsel 6.0 pre-built binary packages from pkgsrc
NetBSD/sbmips 6.0 changes
The NetBSD/sbmips mailing list, covering NetBSD's port to sbmips machine:
Mail the NetBSD/sbmips port maintainer