While I understand where you are coming from, and I flip flop between agreeing with you and not, in the end I would have to say I don't. Pathfinder, Arcana Evolved, Castles & Crusades, OSRIC and all the other games that are similar have things that set them apart enough to be considered their own thing (some games more than others). There is more to an RPG than just the ruleset, although that can be a big part of it, and many of these games have a different enough feel than D&D and/or enough differences in the rules to set them apart. Once we start trying to make these distinctions you are never going to get people to agree on what is or is not basically still D&D.
That's fair. The way I see it, D&D of different editions, Pathfinder, Arcana Evolved, and so on are analogous to different types of burgers. There's some difference between a Big Mac and a Whopper, and you can discuss which one is "best" (or "most suited to your preferences"), but they're a lot more similar to one another than they are to a bowl of chili.
Since the OP just asked if anyone "Can you name a good fantasy TTRPG that's not D&D?" without any additional info or restrictions then any TTRPG that doesn't have Dungeons and Dragons on the cover fits the bill.
And in that spirit:
Ars Magica: Interesting game set in "Mythic Europe" (aka Europe with fantasy/fairy tale/legendary elements). Does a lot of things differently, notably the focus on "Troupe play" where each player controls both a Magus and a Companion (highly competent character that's not a magus), plus a bunch of commonly controlled "grogs" (servants and guards). The idea is that the Magi are part of a Covenant, which is just a fancy word for "group of magi more or less working together, usually based in fixed location", and in each adventure you send one or more Magi off to deal with a thing and they bring along the Companions of those players who are not playing Magi this time around. The game is designed to be rather slower-paced, with lots of stuff for downtime. The expectation is that there is an "adventure" maybe once a year, and the rest of the time the magi are doing research and stuff. The magic system is also very interesting, being based around five techniques/verbs (create, destroy, control, transform, perceive) and ten forms/nouns (air, earth, fire, water, body, mind, animal, plant, magic, image) which you combine to make spells.
TORG Eternity: TORG is set in an action-movie version of the modern world, except various regions of the world have been invaded by other worlds, and these invaders bring their own realities with them. So you get a multi-genre world with classic fantasy in Scandinavia and the British Isles, 30s pulp with strong Egyptian mystic elements in the Middle-East and North Africa, techno-horror combined with Max Max-style post-apocalypse in Russia, Victorian horror in India, Land of the Lost-style stone age dinosaur jungles in parts of North and Central America, a cyberpunk theocracy in France and Spain, and techno-thriller with biohorror elements in east Asia. Things work differently in these other realms, though you can usually override the local reality for a while. PCs are Storm Knights, who have a much greater ability than most in maintaining a connection to "home", and they usually work for/with the Delphi Council which send them out on missions to thwart the invaders in various ways. The game system uses cards in addition to dice, and does so in a way that make victory the result of cooperative card play. The cards also serve part of the same function as 13th Age's escalation die, in that PCs often start out as underdogs in an encounter but find advantages to turn things around.
