"Eveinstaller is great tool similar to Ubuntu Tweak, it lets you
install the basic applications in Ubuntu 11.04 and LinuxMint with a
simple click, also using this tools, you can add Medibuntu, getdeb
, Playdeb repositories , or install elementary theme, Mint theme,
for Desktop, install also with a simple click Gnome3, Unity 2D,
Unity 3D and more."