The software is Eltechs' ExaGear Desktop, which is designed around running x86 binaries on ARM-based mini PCs. The proprietary software implements a Linux container on ARM and still claims to be 4.5x faster than QEMU. The software also supports running Windows x86 programs on ARM via Wine.
The ARM-based system must be running Ubuntu 12.04 or newer for support and the hardware requirements is ARMv7 with NEON and VFP32 -- so Raspberry Pi and other low-end hardware is out of the question. There's also no support right now for 64-bit Linux x86_64 applications and also lacking is 3D hardware support for the applications... If those limitations don't discourage you, the software isn't free and open-source but will set you back $30 USD though currently Eltechs is offering it up for $15.
You can learn more about ExaGear Desktop at Eltechs.com.