How to turn anything into a router
https://nbailey.ca/post/router/
Fortunately, you can make a router out of basically anything resembling a computer.
I’ve used a linux powered mini-pc as my own router for many years, and have posted a few times before about how to make linux routers and firewalls in that time. It’s been rock solid stable, and the only issue I’ve had over the years was wearing out a $20 mSATA drive. While I use Debian typically, Alpine linux probably works just as well, perhaps better if you’re familiar with it. As long as the device runs Linux well and has a couple USB ports, you’re good to go. Mini-PCs, desktop PCs, SBCs, rackmount servers, old laptops, or purpose built devices will all work.
RouterBoard.com : RB912UAG-2HPnD
http://routerboard.com/RB912UAG-2HPnD
The RB912UAG-2HPnD is a very versatile device. It is a small wireless router with an integrated 2.4GHz high power wireless card and an additional miniPCIe slot for 802.11 wireless, or 3G card. The Gigabit port helps to utilize the full potential of 802.11n wireless speeds.
Installing On Asus Routers (RT-N16 etc) in Linux - TomatoUSB
http://tomatousb.org/tut:installing-on-asus-routers-rt-n16-etc-in-linux
Folded Toad Froth: Linksys WRT54G with bluetooth console access
http://foldedtoadfroth.blogspot.com/2010/03/linksys-wrt54g-with-bluetooth-console.html
My prefered solution for general router console access is via a Bluetooth connection. This Bluetooth connectivity is provided with a Bluetooth module such as the "BlueSMiRF" module sold by SparkFun (see note below). The Bluetooth connection is based on the SPP/RFCOMM profiles which this module supports. Access from Windows, Macs, and Linux systems quite easy. I use hyperterm on Windows-based systems and minicom on Linux-based systems.
Asus WL-700gE WiFi Router: Built-In 160GB Drive, iTunes, and Bittorrent - Gizmodo
http://gizmodo.com/gadgets/wireless/asus-wl700ge-wifi-router-builtin-160gb-drive-itunes-and-bittorrent-193470.php
"it has a BitTorrent client that can rip down 7 streams automatically"