Actually, the books are pretty easy to find.
Found and ordered a few of the Providence books to add to my collection (insert lame evil laughter here). Can't wait to tear into them.
By that I mean the OLD GLORANTHA
Mind sharing a bit more about what made Glorantha stand out? I was a bit young when much of it was comming out and my limited funds were all being chunked out on D&D so I never did delve into any of it.
Harn (from columbia games) and the Wilderlands (from judges guild)
So you mean don't forget these off D+1's list, or do you mean that they were original settings deserving mention? If the latter, then by all means, spill a little about them. If the former, really, there's no need to requote such a large list/post that has been quoted 3 other times already
Anyhow, another contribution is in order:
Shadow World
This is another setting that, if someone described it to me, I would normally have stayed away from it. Its a mixture of everything, including the kitchen sink. Its like Tolkien meets Lucas, who then go on to partner up with Heinlein, with editing done by someone into Japanese style fantasy. The planet itself is monsterously huge, with most regions only being glossed over (either because the line was cut several times, or for DMs to develope on their own). Heck, even the map itself in the box set was a 3'x4' map of the western hemisphere. There are gods, but they are strange and immaterial beings of great power that dwell on one of the planet's many moons. The planet itself is home to a strange energy called the Flow of Essence. Those who use 'magic' tap into the flow, but they must be wary because the flow is mutable and unpredictable; sometimes the flow can coalesce into powerful energy storms, wreaking havoc into those who use its power. There are ancient remains of a star-spanning empire ruled by the original inhabitants of the planet, who were powerful Lords of Essence, truly gods amongst men, but that empire had long since crumbled. There are fantasy races such as elves, dwarves, and dragons, but most of these had evolved from the original natives and had been altered by the planet's energies. And behind everything lies the Unlife, an intangible force that seeks to destroy and consume everything in its path, corrupting everything it touches. The lands and cultures are quite varied, as most of the continent sized island chains have spent 100,000 years isolated from one another and range from feudal lands ruled by elected monarchs living in floating cities to entire regions dominated by shapechanging dragon-tyrants who have been corrupted by the Unlife.
Shadow World is a bit of a hybrid setting, mixing all kinds of genres. The Unlife adds a touch of horror, there's sci-fi in the way that magic (and psionics) are presented with the Flow being almost a studied scientific phenomenon rather than magical, yet there are elves and sword swingers aplenty who don't seem 'out-of-sorts' with the rest of the setting. There's nearly 200,000 years of history to draw upon (the setting follows after the time of another I.C.E. setting called Space Master, one which unfortunately, I know nothing about) and plenty more campaign hooks and adventure seeds than you could want in a setting. I give the setting a total of four d6's for being unique.