Seeed Studio already released the Grove - I2C Hub (4 Port). Now they also have a 6 port version, the same size, two more connectors, and almost half the price!
As you may know, the 7 address length I2C bus allows up to 128 I2C devices to access. At present, there are over 80 Grove I2C modules in Seeed, however, normally only 1 or 2 Grove I2C connectors are available on the Seeeduino Board or the Grove Base Shield. What if we need to use multiple Grove I2C modules in the system? The answer is this Grove - I2C Hub (6 Port).
There are 6 Grove connectors in this hub, one input, five outputs, or you can even connect one hub with another, so that more devices can be plugged in. Not only I2C, it also can be used to control several synchronous change devices(like LEDs).