So, because of my ardent hatred for
GW's Cadian heads, I've been searching a variety of places looking for alternate heads from non-
GW companies that I can use for Imperial Guard minis. Here's what I've come up with so far:
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Pig Iron Productions
Carrying the ever-popular Kolony and Heavy Infantry heads

Purchasable through
The War Store.
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West Wind Productions
West Wind has actually got a couple different lines of really useful heads including their
WWII Separate Head System,
Secrets of the Third Reich heads. and some historicals like
Arthurians (which has a variety of useful bare heads) and
Samurai (which, in theory sounds really good, don't look nearly as good as some of West Wind's other items). Highlights include the WWII British Paras in Berets sprue, SoTR German Gasmask Head Field Cap, and Arthurian Britith Heads.
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Anglian Miniatures
Anglian miniatures looks to have a line developed for Spanish Civil War historicals. These seem to be pretty specialized with Czech helmets and Carlist beret heads. $3.50 for 4 heads. Might be good for some Napoleonic-style
IG.
Purchasable through
Brigade Games
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The London War Room
They've got listings for a bunch of historical lines. I didn't look at all of them, but the only line I found with separate heads is their
Vietnam War Figures. They don't have any pictures of their separate heads, but I'm figuring you can get an idea of them from the full figure pics - but that's an assumption on my part. They have separate heads for both U.S. Army as well as Vietnamese Army figures. Some of the U.S. army heads look fairly useful, but I'm less than impressed by the Vietnamese heads. The Boonie Hat heads from both sides might be useful.
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Hasslefree Miniatures
Hasslefree has actually got a pretty large selection of bare heads - and I mean, like bald heads. The notes on these specify that these are designed for you to sculpt your own hair/hat/helmet whatever you want. Pretty useful. Not only that, though, they have bare elf heads, goblin heads, orc heads, dragon heads, alien heads, dwarf heads (I feel a little like Cheech Marin's character in "From Dusk til Dawn"). Heck, Hasslefree even has a helmet wings pack, for adding wings to your helmets.
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Micro Arts Studio
Micro Arts Studio has got a couple different head packs which are generally more useful for Fantasy than
40k, but some could definitely see some use. The barbarian heads could definitely be used for
IG, Chaos, or
SW.
The Guard heads would make for a great
WHFB Empire army or an eclectic
IG army.

.
And the Knights head sets could make for some good
IG, Empire, or Bretonnians. And frankly, all the sculpts are really nice!
Can anyone else add any other cool head packs they've found?