Everyone has heard of STORJ, right?
STORJ is a method of renting out HDD space, you will be paid in STORJ tokens on a monthly basis. If you have any spare HDD space and it isn't earning an income then you should check it out. https://storj.io/share.html 
I have it all setup, but it wouldn't port forward for me and I wasn't getting anything from it. I moved onto Komodo and Siacoin to use CPU and GPU.
There are many port forwarding tutorials online, it is quite easy. You must also set a static ip address for it to work properly.
Yeah I know how to port forward, it just didn't want to work but no matter, running a third miner would be a bit much.
I've not heard of Komodo, I must look into that one, thanks : )
Have had it running for a week or so now - we'll see how it goes!
You only get paid for the space that they have filled (it is quite slow to fill up), you also get paid for bandwidth usage. It seems to be quite good.