The Netgear KWGR614 is promoted as an "Open-source Wireless-G router for hobbyists". Firmware is available online.

Package Contents

Router
2 detachable 2dBi SMA antennas
Setup CD
Power Adapter
Ethernet Cable
Warranty/Support Card

Interfaces

2 SMA antenna jacks
1 ADSL jack
4 Ethernet jacks
1 Reset button
1 Power jack

The KWGR614 is based (according to the support, chip is covered by passive fan) on a RTL8651B chipset with a 200Mhz RISC CPU. The wireless chipset is a hardwired RTL8185L. Memory is realized with a 16 MByte EtronTech EM38165TS-7G SDRAM and a 4 MByte Macronix 29LV320CVBC-90G chip. There are no obvious internal debug interfaces.

Firmware can be updated via http interface. The firmware page also describes how to download a new firmware via TFTP.