Your most modded game?

Skyrim at 92 mods, but most of them are graphics mods so they take up a good 5 gig+.

Currently, Skyrim. But the Half-life games have seen the most mods come and go throughout the years. Some really good mods too. Campaign mods though, not alterations but additions.

Just Cause 2.
Panau Island = MAD MAD MAD

Skyrim with 83 stable mods, all i do is pretend i am a hunter and go walk around in the forest and kill animals with a bow

Race 07.

In this order:
HL2
BF Vietnam
BF 1942

Left 4 Dead 2 (would probably be Skyrim if I had it on Steam and if my computer wasn't a potato (aka a laptop))

Morrowind. Ive had over 250 mods on my comp back in the day. (not all on at the same time)

GTA IV

Football Manager (skin and logo mods)

skyrim and Morrowind

Left 4 Dead 2

Haven't really added too many mods for any games though.

All time: either Morrowind or Half-Life

Currently: Europa Universalis IV

Fallout (3+NV)
Skyrim
Garrys Mod

(never cared to count the mods, but those come with many mods...)

Don't Starve, 9 mods.

Skyrim, 6 mods.

GTA San Andreas
GTA 4
Gothic Trilogy
Currently playing on modded Euro Truck Simulator 2 ;)
Also I was modding ATI drivers, but that was back in 2005 or something :P

Fallout NV

Skyrim

Left For Dead 2

From Steam: Skyrim (about 10 mods).

Out of Steam: Minecraft (about 60 mods).

Minecraft.

I don't really mod much else. Few custom things in F1 2013.

Game I own with the most mods available for it: Neverwinter Nights.

Game I own with the most mods currently installed on it: Oblivion.

skyrim

HoI2, EU3, Starcraft, Total Annihilation and Total Annihilation Kingdoms in no specific order.

Euro Truck Simulator 2, Torchlight 2 and Left 4 Dead 2.

skyrim and fallout nv

Torchlight 2