TOWRITE
Parity
Parity is an Ethereum client, written from the ground-up for correctness-verifiability, modularisation, low-footprint and high-performance. It utilities the Rust Rust programming language, a hybrid imperative/OO/functional language with an emphasis on efficiency. You will find here a chart showing the efficiency of this client compared to geth or eth.Parity is professionally developed by Ethcore.
As pointed by Vitalik Buterin in this twit, it is highly recommended to connect to Ethereum with this client, especially with minimum version number 1.2. It seems Parity is gaining traction among the community and may become the upstream ethereum client.
Parity runs on Linux, Mac OS and windows.
Build and install
You can build parity from source following these instructions, or install binaries if your Linux distribution have such a package. Please visit the parity page on Ethcore to download binaries or a Docker image. Archlinux users will find two packages in the AUR repository. The build and installation should normally go smooth if your machine is up to date and correctly setup.
Run
Geth
Eth