Lots of them.
For example, check this thread here on MacRumors:
Which USB 3.0 Hub? [MERGED]
For myself, I recently purchased the CalDigit TS3 Plus. It may be more than what you need, but I can say from my short experience with it that I am very satisfied with it. Well made, solid device. I purchased from Amazon, where CalDigit is the seller.
Check this out as well:
If your computer has Thunderbolt ports, a Thunderbolt dock is faster and more versatile than a USB hub. We have options for every budget.
www.nytimes.com