Guake
Drop-down terminal for GNOME
...This makes it useful for developers, system administrators, and Linux users who want fast terminal access without constantly managing separate windows. Guake supports tabs, customizable appearance, hotkeys, and session-oriented terminal usage. It is designed to stay out of the way until needed, then provide immediate access to a shell from the top of the screen. Its main value is speed, convenience, and a lightweight workflow for users who repeatedly switch between graphical apps and command-line work.