LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
fish shell - The friendly interactive shell.
Zeal - Zeal is an API Documentation Browser.
zsh - The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a powerful command interpreter for shell scripting.
Devhelp - Devhelp is a GTK+/GNOME browser for API documentation; it works natively with gtk-doc (which is the...
PowerShell Plus - Learn how to learn and master PowerShell fast with an interactive learning center, a powerful IDE, pre-loaded scripts, and a PowerShell Editor… all for free.