http://www.pcengines.ch/apu.htm
Although once you add the wifi, case, power supply, and SD card or mSATA SSD, it's a bit on the expensive side.
People definitely need to be more aware of the x86 BSD based routing platforms like m0n0wall: http://m0n0.ch/wall/ and its fork pfsense: https://www.pfsense.org/
I'm surprised the EFF isn't championing some fork of those platforms, or just those two themselves. Trying to fix the problem by adding yet another platform is just going to cause problems. I'm a huge fan of the EFF but it seems to be championing rather strange initiatives lately like the open WiFi and now this.
https://www.turris.cz/en/hardware
This device is a lot more powerful than the PC Engines APU. As nice as the APU is, its CPU cannot support 1Gbps throughput over the NICs.
What you linked is a dual-core 1.2GHz 32-bit PPC built on a 45nm process. The APU used on the board I linked to is a dual-core 1GHz x86_64 built on a 40nm process. There's no way the PPC core is dramatically faster than the x86 core that was shown to have better IPC than Intel's Atom. The PPC SoC might be able to offload a lot of network stuff to fixed-function hardware, but one of the primary lessons learned from the CeroWRT project is that you can't trust any of the offload stuff to be well-behaved with respect to things like queue length management.
The 1.2GHz PPC based router is hitting ~940Mbit/s (the most you can expect from a GE interface with protocol overheads) using iperf. I don't have a reference for that, but I've got one of the devices here and have performed that test myself.