Banana PI BPI-M2 Zero is the open source hardware platform,Banana PI BPI-M2 Zero is an quad core version of Banana Pi,it support WIFI on board. use Alliwnner H2+ chip on board. and mini size only 60mm*30mm, all ineter face same as Raspberry pi Zero W.

Banana Pi BPI-M2 Zero series run Android,Debian linux,Ubuntu linux, Raspberry Pi image and others image. Banana PI PBI-M2 Zero hardware: 1Ghz ARM7 quad-core processor, 512M DDR3 SDRAM, and SDIO wifi module on board.

BPI-M2 zero Hardware interface:

hardware spec

wiki page:

http://wiki.banana-pi.org/Banana_Pi_BPI-ZERO