Action games
If you don't play games that much, there is a big chance you have played an action game, e.g. a shooter, at some point. This category is full of games that won't let you get bored.
Left4Dead2
Survival: Postapocalypse Now
Action 52in
Thunder Brigade
Monster Browser
They Bleed Pixels
Terrordrome The Game
Half-Life Visitors
Megaman - Revenge of the Fallen
Last Space Fighter
Ghost World 3D
Animaniacs
Christmas Gifts
Playing with Fire
Mad Magic
Bonbon Quest
LightWeight Ninja
Ghostbusters
The Legend of El Dorado Deluxe
Zombie Hostel
Half-Life 2: Lost Coast
HLFX Lost in Black Mesa
BaboViolent
Alien Hallway
Raze
Client Epsilon
Terminator 2 - Judgement Day
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.