These days I found a really nice project called Terminator.
Essentially, it agreggates and organize in a grid and/or tabs your terminals. It's not a brand new one, but it's working fine for me -- caveat emptor.
Installing: sudo apt-get install terminator
Some useful shortcuts:
splits vertically: Shift + Ctrl + E
splits horizontally: Shift + Ctrl + O
alternate between terminals: Ctrl + Tab | Ctrl + Shift + Tab
Right click -> "Preferences" -> "Keybindings" for other shortcuts.
A screenshot:
Hugs,
Ronald Kaiser