Raspberry Pi Compute Module I/O Board V3
The Compute Module IO Board V3 is a development kit for those who wish to make use of the Raspberry Pi in a more flexible form factor, intended for industrial applications. The IO Board V3 is made for developing with CM3, CM3L, and CM1. (This kit replaced the original Compute Module IO Board in January 2017).
This item is just the I/O board, and does not contain a matching Compute Module (you can pick one up here). The Compute Module contains the guts of a Raspberry Pi 3 (the BCM2837 processor and 1GB RAM) but does not have any easy-to use ports for development. That's where this IO Board comes in!
The accompanying IO Board is a simple, open-source breakout board that you can plug a Compute Module into. The board hosts 120 GPIO pins, an HDMI port, a USB port, two camera ports, and two display ports. Designing the Module into a custom system should be relatively straightforward as the Raspberry Pi Foundation has put all the tricky bits onto the Module itself, and you have the freedom to add extra components and place parts exactly where your product needs them.
Once you've got your design and peripherals chosen for use, you can take the I/O board design files, remove all the components you aren't using, and get the perfect Pi design for the Compute Module!