Rxvt-unicode. A customizable terminal emulator.
Open a new urxvt window
urxvt
Run in a specific directory
urxvt -cd path/to/directory
Run a command in a new urxvt window
urxvt -e command
Run a command and keep the window open
urxvt --hold -e command
Run a command within the `sh` shell
urxvt -e sh -c command