Geth

Geth (or called as go-ethereum) is an implementation of Ethereum, Whisper, and Swarm nodes. Geth can be used to be part of all of these or only selected ones. The reason for combining them is to make them look like a single DApp and also so that via one node, a client can access all three DApps.

Geth is a CLI application. It's written in the go programming language. It's available for all the major operating systems. The current version of geth doesn't yet support Swarm and supports whisper a some of the features of Whisper. At the time of writing this book, the latest version of geth was 1.3.5.