https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-85-ASM/o... was used for keyboard emulation :)
It's both weird and wonderful that they show two out of three pictures with the full-size ("printer style") USB B connector.
I guess old Arduinos had that, so they're trying to be part of the family, but it seems like a rather obnoxious choice for a board that small.