There absolutely is. There are PCIe cards you can plugin and use them as accelerators, just like you would use a GPU. Of course programming them to do the task

There absolutely is. There are PCIe cards you can plugin and use them as accelerators, just like you would use a GPU. Of course programming them to do the task you want is harder, but it can do anything. Saw a great example where someone implemented memcached on a single FPGA plugin and replaced many Xeons with it.