The Doctor
The Doctor's 'Toys'
Tardis - The TT Capsule
Time And Relative Dimensions In Space
Type 40 - Mark I
It's Bigger on the Inside.
The Doctor's ship. Semi-sentient and linked to The Doctor empathically, the Tardis can, at times, make decisions for itself, protecting it's crew, keeping out ill-intentioned intruders, providing inhabitants with the understanding of languages of the area it was located in and even projecting feelings onto the inhabitants in times of crisis or danger.
Designed for time and space travel via the Time Vortex. It used its dematerialization circuit to dematerialize and re-materialize at will into the Vortex. The Type 40 was actually designed to be operated by six pilots working as a team. When fully crewed, it is capable of remarkable feats, including towing an entire planet through time and space
The TARDIS' outer plasmic shell had the properties of a solid conventional object. With its chameleon circuit, it can change shape. The TARDIS seemed to weigh roughly the same as the object it was disguised as, rather than manifesting the immense theoretical weight the interior possessed. The Doctor's ship is almost impervious to brute force attacks. The Doctor once stated to Rose that "the assembled hordes of Genghis Khan couldn't get through that door".
The HADS (Hostile Action Displacement System) is one of the defense mechanisms of the ship. If the outer shell comes under attack, the unit dematerializes the TARDIS and re-materializes it a short distance away, in a safer locale.
The Sonic Screwdriver
Mark VI (Go on then, click it)
Psychic Paper
A blank, white card that had special properties. When shown to a person, it can usually induce them to see whatever the user wishes them to see printed on it. It can even be used to open doors in place of a keycard.
In the hands of an untrained user the paper is prone to displaying facts they subconsciously wanted the reader to be aware of, often leading to embarrassment.
Individuals with powerfully creative minds also seem to be immune to the effect of the paper, although this only occurs in truly exceptional cases.