...
There are four active clients to connect to Ethereum network, ordered here by popularity: Geth Geth, Parity Parity, Eth and AlthZero.They enable you to execute “Ethereum programs” on your computer.
If you have a laptop or desktop machine, you should probably just install the Ethereum Wallet and you are done. The Ethereum Wallet is a “single dapp” deployment of the Mist Browser which will be the centerpiece of the Metropolis phase of development, which comes after Homestead.
The wiki will stick to the two most popular clients, Geth and Parity. Please visit Etherdocs: choose a client in case you are interested by any other ones.
...