zsh is the stable shell version. This is now the 5.0 series, which is the latest version. zsh-doc is preformatted documentation associated with zsh. The main shell build already comes with manual pages and a Texinfo source, so you only need this if you want info, HTML or PDF formats and don't have the tools. zsh-test is for unstable pre-release versions. Pre-releases are named after the stable rel