You could use xmrig to mine cryptonight coins, but I don't think you will get great profits 
https://github.com/xmrig/xmrig
I recommend configuring xmrig to only utilize 50-60% of your CPU to not cause stability issues for your main GPU mining software and OS.
When I began mining, I had the CPUs of my rigs running on Monero but the profit was not worth mentioning and it caused stability issues especially when remotely administrating the rigs.
https://github.com/xmrig/xmrig
I recommend configuring xmrig to only utilize 50-60% of your CPU to not cause stability issues for your main GPU mining software and OS.
When I began mining, I had the CPUs of my rigs running on Monero but the profit was not worth mentioning and it caused stability issues especially when remotely administrating the rigs.