Look up Mikrotik switches (on Amazon) and Aquantia PCIe cards for 10Gbase-T using CAT6 or CAT6a.
You can use 10G SFP+ NICs with direct attach cables (DACs) or short fiber runs with switches that have SFP+ ports, including from Mikrotik, and that may be a better option depending on what all you want to hook up at 10Gbit.