[TrashMan]

Let's see...

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Currently installed on my HDD and current status:
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Spellforce (on pause),
Jagged Alliance 2 (not done any modding yet),
FREESPACE 2 (done lot's of modding - ships, weapons, missions, a little bit of everything),
ST:ARMADA 2 (modding...re-balanced the game, added ships & weapons)
FREELANCER (modding..made ships, weapons, systems...re-balanced the game))
TEMPLE OF ELEMENTAL EVIL (none)
ST:BIRTH OF THE FEDERATION (modding)
DIABLO 2 (none)
STARCRAFT(a bit)

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Currently uninstalled, but have modded and have backups of my mods
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NEVERWINTER NIGHTS (made lot's of weapons and maps, started my own campaign)
WARCRAFT 3 (made elves a separate race with own units and upgreades, and started a small campaign)
STARFLEET COMMAND 3 (nothing much...basicly re-balancing the game)
BRIDGE COMMANDER (added ships, re-balanced the game)

Probably more...can't remember right now...

[TopAce]

Just realized:
I also modded StarCraft a bit(if we disregard map editing). I used a weird, but good program named as 'StarDraft'. I edited the default unit properties, made the Ghost a real sniper and I did some other simple modifications, too.

[diamondgeezer]

I gots a couple of simple mods out for X-Plane. Seem pretty popular

[Ulala]

I uh.... FRED2... yep, that's about it.

[TopAce]

That's enough for us.

[Hippo]

I mod Halo PC...

[Setekh]

I mod everything. Can't help it. Mostly for personal use, I've only ever released stuff for community use with FS2.

[HotSnoJ]

I've only modded FreeSpace (1 & 2). Mostly because it's the only game I own that is simple and has a great fan (and knowledge) base. As well as because when I look into modding other games they look extreamly hard to do anything for. FS, IMHO, was and is one of the few games that had modders in mind when it was made.

[Bobboau]

I tried modding red faction but that didn't turn out too well, meh, FS is the only game worthy of my godlike touch