The Doctor Who Miniatures Game (2nd edition) is an unofficial fan-produced 64 page PDF, allowing wargaming in the many times and worlds of Doctor Who.
 
This was followed by numerous classic and new series supplements, all offering new rules, profiles and scenarios to add to the game.
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The rules formed the basis for 7TV 1st edition by Crooked Dice, and remain a classic set of easy to play rules for gaming Doctor Who. This purchase will get you the following PDFs:
 
The DWMG Core Rules 2nd edition
The Secondary Control Room expansion
Bad Wolf
The Battle for Canary Wharf
Carnival of Monsters*
The Curse of Fenric
The Daemons
The Dominators
Dreamland
The Five Doctors
Fury from the Deep*
The Green Death*
The Infinite Quest
Invasion of the Dinosaurs*
The Key to Time
The Last of the Time Lords
Pyramids of Mars
Series 5 (yes never properly named this one)
Shada
Survival*
The Talons of Weng Chiang
The Visitation*
The War Machines
Warriors of the Deep
The Web Planet*
Welcome to Torchwood
 
*: as part of the original Carnival of Monsters compendium, which also contains:
Cybermen variants
Orcini & Bostock
 
You can also purchase a physical deck of 120 properly printed stat cards for all the profiles in the core rules.