Ethereum ether mining
The latest version of the wallet includes an automatic conversion between ether and bitcoin. Due to the nature of the algorithm for block generation, this process generating a proof of work is guaranteed to be random and rewards are given ethereum ether mining proportion to the computational power of each machine. If you are on a private network and if you just want to test the technology for free, you should then any normal computer with a ethereum ether mining CPU will be able to run the network and earn test ether ether that is only redeemable on the test network where it was generated through mining.