Zsh
Zsh, z-shell is a more flexible and configurable shell. It offers an enhanced scripting language, greated configurability and pluggability over the standard shell while still implementing both the POSIX standard and conventions used with bash, dash and sh (as the POSIX standard is unfortunately far from complete).
Themes
Geometry is a minimal and customizable zsh prompt theme
Utilities
fasd is an all-in-one shell productivity booster fuck corrects your last console command.
Alternatives
Oil shell is a new Unix shell alternative that can be compiled and deployed as a native executable. https://github.com/nushell/nushell
Configs
https://github.com/jeremyf/dotzshrc Be careful editing bash scripts