Here we have some useful products for the Raspberry Pi! Here are some informations:
* HATs: These are extension boards that you simply plug onto your Raspberry Pi. They're Plug and Play!
* pHATs: Similar to HATs, but you need to solder them. You can combine those however and use them with the Pi Zero.
* Pibow with extension layers: One of the best cases for the Raspberry Pi - which can be modified with extension layers