We also have a board, which uses FX3:
You can find more information at : http://www.linera.com.tr/en/products-and-services/products/
FMU3-S6 series is a spartan-6 based board with USB3.0 support. It has an on-board DDR3, a programmable clock synthesizer, Flash, and a microSD card slot, all in a 65x50mm package.
FM-S6 series does not have an FX3 on-board, but it is smaller: (50x50mm) and is pin-compatible with FMU3-S6!