Laptop

Laptops were personal computers used on Earth.

The Xylok later known as Mr Smith first communicated with Sarah Jane Smith using her laptop. (TV: The Lost Boy)

The Eye-5 lens could be connected to a laptop computer. (TV: Children of Earth: Day Four, Dead of Night)

The SerfBoard was a type of laptop computer. (TV: The Man Who Never Was)

Jeff Angelo had one in (TV: The Eleventh Hour) which The Doctor used to hack in on a conference call between some of the most advanced scientific minds in the world in an effort to spread a computer virus to show the Atraxi where Prisoner Zero was and therefore save the Earth from incineration.