GL-Inet.com creates nice clones of TP-Link WR-703 routers. They run OpenWRT out of the box, and have 2 ethernet interfaces, a 2.4Ghz Wifi (802.11n) radio, a usb2.0 port and 5 free GPIO ports. Available on dealextreme/alibaba or in the RevSpace vending machine.
RevSpace images and packages
Alternative packages and install-images for OpenWrt (trunk) for GL-Connect GL-iNet v1 (GL-iNet-6416A) devices, Build-environment for the GL-Inet, http://glinet.sigio.nl/. You will need the openwrt-ar71xx-generic-gl-inet-v1-squashfs-factory.bin file, md5sum ad2164a70e4ccc9a40f77bf49d3bb472
Note that using a custom build means you can't use the normal repositories for kernel-packages.
|Model||GL-iNet 6408A / 6416A|
|CPU||Atheros AR9330 rev 1 - MIPS 24Kc V7.4 (265.42 BogoMIPS) 400Mhz|
|Rom||8MB (6408A), 16M (6416A)|
|Interface||2× 100mbit/s RJ-45 (LAN/WAN), 1× USB2.0, 1× Micro USB (power)|
|LED||Red and green. When both turned on amber-ish.|
|Button||Press to toggle wireless radio; Press and hold for 8 seconds to restore factory default settings|
|Antenna||Inverted F PCB trace antenna DN007 *1 https://www.ti.com/lit/an/swru120b/swru120b.pdf http://hackaday.com/2014/02/28/pcb-antenna-reference-designs/|
|DIY Features||Uboot web interface; Uart soldered; 5 GPIO|
|Power Supply||5V/1A micro USB (not included @ RevSpace market)|
|Weight||42g (router only)|
|Power Consumption||Less than 1 watt|
|Temperature||Working temperature 0°C - 45°C. Storage Temperature -40°C - 70°C|
The device runs OpenWRT out of the box, but it's quite easy to build your own image.
- Baudrate: 115200
- Handshake: none
- Flow-control: none
Maxell's shopping list for the external antenna modification.
- IPX naar RP-SMA pigtail, RG178: 
- Surface mount IPX: . New(er) PCB's already have these in place. Check your GL-Inet before buying.
Widely sold as the "Nokia5110 display" (but actually most famous for being the display of the Nokia 3310), this 84 × 48 graphical display can easily be added to a GL-Inet and controlled by bitbanging SPI with the GPIO pins. It uses 4 GPIOs, leaving one vacant, if you simply tie CE/SCE to GND.
Note: some of these PCBs come with a current limiting resistor of 150 Ω for the background LEDs, while others don't. Add your own resistor if your board didn't come with a resistor, or the LEDs will wear out very quickly.
OpenWRT Patch: https://dev.openwrt.org/ticket/15632
Build instructions for OpenWRT: https://gitlab.com/Raymii/openwrt-gl-inet/tree/master
OpenWRT Forum topic: https://forum.openwrt.org/viewtopic.php?id=47715&p=2
More images: http://shiki.tk/?p=2888
External antenna: http://shiki.tk/?p=2940
LAG Project page: https://wiki.laglab.org/Gl.inet