Windows: The command line is an extremely powerful tool, but it's not perfect. Clink makes it a little bit better by adding extra features and formatting.
Clink adds several new features including the ability to paste commands from your clipboard into the command prompt box. This alone makes it worth a look. It also adds searchable command line history that persists across sessions and better autocomplete. Best of all, Clink runs automatically whenever the regular command prompt is called. If you didn't know better, it would be almost invisible.