I use the free miner on NiceHash to mine BitCoin. So long as you benchmark using the precise setting (its really straight forward, just follow the prompts when you install it) you can get some decent speeds. Well, so long as your hardwares good, of course. I wasn’t sure at first but I left it running overnight at work and when i came back in the morning I had €2 worth of bitcoin, for free! Sounds like hardly anything but it’s basically free for me to run and I don’t care if the hardware takes a hammering because it’s just an old work computer. Even if it was my rig at home I don’t think I’d be too bothered because it’s not too strenuous, really. Not sure how well of a reputation NiceHash has though so I transfer all my earnings to Coinbase as soon as I hit the transfer threshold. At the moment I’m just sitting on it, not really researched trading in and out so happy to just keep hold of it for the time being and hope it grows and grows in value. For something completely free, I can’t complain whether it ends up being worth a couple of quid, or a couple of hundred or thousand. It takes no effort. Even if you just download the miner to take a look and see if you think it’s worth the time it’ll take to make anything, it’s worth a shot.