This is a Breakout Board for the ACS764XLFTR-32AU-T (& ACS764XLFTR-16AU-T) Integrated, Hall-Effect Based Current Sensor. This excellent i2c current sensor has been recently unfotuntaely discontinued with no direct replacement. However it's still a fun sensor to use. The Breakout board has I2C pull-up resistor pads and a voltage divider network for I2C addressing purposes, all on easy to solder 1206 pads. The Board also has standard spade terminals & 2.54mm headers sapced for use on standard breadboards.
The panelized version seen in the images of the manafactured boards are panelised with the gerbers with this excellent tool: http://blog.thisisnotrocketscience.nl/projects/pcb-panelizer/