Billion first provided network equipment and power supply products in Asia. Since it's founding in 1972 they have expanded to include internet access devices. It has become one of the more popular manufacturers of both wired and wireless routers. They are simple to set up, and tend to have very good operation features.
As a rule Billion routers are pretty easy to configure, and their port forwarding section is no different. Some of them have a list of 10 places where you can forward a port to internal devices. Others will need to be added one at a time. Either way the Billion routers have what you want for port forwarding.
If you cannot find your exact router in the list below, try following one of our Billion 400G guides. That should get you an open port on pretty much any Billion router.