I'm probably one of the only people that likes Traveller because of the Third Imperium. The Traveller system itself is Ok, I guess. But the thing I really love about Traveller is the Sword Worlds, the Darrians, the different types of Humaniti, the Solomani Rim, etc.

Fading Suns, minus the Symbiots and the Space Crusade.

Stars Without Number. I love the distinction between Pretech, Postech, and Maltech. Unbraked AI's. Spike drives. The Scream and the Silence. It has a post-apoc feel to it, and that's even before you get into Other Dust.

Again, I'm probably in the minority on this, but I loved the later WEG Star Wars stuff when it got away from Star Wars and started exploring the outer rim. Stuff like the Platt's Guides and Kathol Rim.

Monte Cook's World of Darkness. The mods to the D20 system are way over the top, but the setting is pure gold. Something evil erupted in Milwaukee and turned the place into a spritual post-apocolyptic hellhole. Chicago is livable, but there are creatures of the night lurking in the shadows. The zone outside of Milwaukee is filled with all sorts of altered-reality weirdness. I think this one would work best as a Hunter game.

LankhmarWalking into the Silver Eel on a foggy evening is always a thrill. I've played in and run games there and in the surrounding areas and always enjoyed it.

Compact Space A friend of mine ran sessions in C.J. Cherrhy's setting. He used an early Traveler variant and made up the stats for the alien species.

Arduin The system was just extended D&D but the setting was well worth seeing.

The Black Mountain District It's the only part of the world that I run on that is publicly available but it is free on the website. I may put up Old Meos, the City next or possibly The Ice River Valley. The Lake Country is the first sandbox my players explored. It's pretty tame now. I may put out a version that depicts it when the first player-characters entered it.

Quote from: Aglondir;988597Spike drives.

.

I do, really, but this thread isn't all about me you know.

Fading Suns it's Warhammer 40k lite, and it does it well.  Except the system.

Rifts I loved Phaseworld, Wormwood, North America, Japan and the first Underseas book, got a lot of mileage out of them.  The system on the other hand, I butchered that so hard it stopped being Palladium and some horrific (and I do mean that, I've taken a look at some of the notes, and I'm genuinely repulsed by just how sloppy my 'fixes' were) mash up Palladium, AD&D 2e and Interlock, both Mekton 2 and Cyberpunk 2.0.2.0.

The Known World, Kara Tur and Dark Sun

Quote from: Dumarest;988571I was just Googling it...apparently it's "Skyrealms of Jorune" and I've conflated the box cover art with the ad art.

The box cover art was used in many of the ads, I remember the full-page color ones.

Quote from: CRKrueger;988667The box cover art was used in many of the ads, I remember the full-page color ones.

Ah, maybe I didn't conflate the two then!

Speaking of ads, anybody know if anywhere online has collected some or all of the old Mayfair DC Heroes ads where they used to include a little write-up or update for a super hero?

The Morrow Project. It is a departure from the typical post apocalypse setting where the players are mission oriented to rebuild society. The rules were weak, but the background materials are good and pull from much PA fiction without blatantly ripping any off. Also like the way equipment was handled allowing the focus to remain on the mission rather than turning into one fuel / ammo hunt after another. The gunporn was nice as well.

Some good mentions here that I agree with:

The universe of Kult: Dark, original and interesting
Planet Jorune in Jorune: Utterly unique and wonderful
The universe of Stars Without Number: The perfect sci-fi sandbox

Some others I like:

The Lands of Legend from Dragon Warriors: A very flavorful fantasy reskin of Europe ca. 1200 AD
The Land of One-Thousand Towers from Anomalous Subsurface Environment: Gonzo post-apocalyptic mash-up (Thundarr + Zardoz + ...)
Hot Springs Island in Dark of Hot Springs Island: Kirby-esque fantasy hexcrawl sandbox on an island

The Sixth World, Prax and Sigil.

1st Edition WFRP, duh. is this even a question?

In all seriousness, a great, great game that only needs a few, easy to do tweaks.

I like the setting in The Mutant Epoch a lot.  That Crossroads Region setting book is really fun...

Mostly the ones I wrote. For stuff I had nothing to do with, probably Mystara.

In no order with the caveat that these are settings I've run:

Cyberpunk 2020 - Simply wonderful. Needs updating, but damn it's good.

Talislanta - I still maintain it's one of the best original sci-fantasy settings out there. It's swords and super-sorcery, dark and awesome with plenty of elbow-room for people to make it their own by intent. Deep history, filled with ambiguity, and lots of potential to scale to crazy levels.

Darksun - Love it. My favorite D&D setting. I really want to run this with Savage Worlds someday.

Vampire - The original setting was brilliant. The system sucked, but I didn't care.

Deadlands - Goddamn this is a fun setting. Pre-Post Apocalyptic glory. Supernatural Wild West with every western trope ever tossed in. Great great setting.

Spelljammer - Everything I want for a sandbox. Where I can literally use anything and everything under the D&D umbrella as I see fit with a whole lot of its own whacky-cool conceits cooked in.

Quote from: Dumarest;988508What are AErth and LEarth?

It's part of a family of game worlds.

On one extreme, you have Oerth (greyhawk), on the opposite end of the spectrum you have Earth. AErth is the closest fantasy world to Earth. Maybe Yarth is next, then Urth, (not sure, I'm not aware of either of those worlds actually being developed). LEarth I'd say is roughly mid-point between AErth and Oerth. I created my own world, Loerth, as being between half way between LEarth and Oerth on the spectrum, or more specifically very LEarth-like in the western hemisphere, very Oerth-like in the eastern hemisphere--even two completely separate variations of monsters and magical traditions. But currently I'm developing something more along the lines of AErth. Maybe ever so slightly more Earth-like. Who knows, though, as it's a work in progress.