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I have a few suggestions. I'll start with Pathfinder:
Midgard Tales (Kobold Press) - While the adventures in this beautiful hardcover (with cloth bookmark!) are not linked, it's not hard to come up with a framing sequence to create a longer campaign that will run from levels 1-10. The adventures range from really good to amazing; my players loved running through all of them.
Way of the Wicked, Books 1-6 (Fire Mountain Games) - In thirty years of RPGing, this is the only campaign that I have been able to get my players to stay invested all the way to twentieth level. Even though the books have run out for us, my players are still enjoying it so much that we have continued on via the Mythic Adventures rules. They are now trying to create a tenth layer of Hell... and trying to convince their infernal master that they should be allowed to run it.
Zeitgeist: The Gears of Revolution (EN Publishing) - I haven't run this... yet. It's an investigation/role-play heavy adventure path set in a country on the cusp of industrial revolution. Act one has been released in hardcover via OBS with the subsequent act(s) to follow. This book is beautiful, a fun read, and, I believe, is the thickest PFRPG book on my shelf.
For D&D 3.5 I can recommend:
War of the Burning Sky (EN Publishing) - Another I've read, but not yet played. The softcover collection on OBS is a bargain... under $30 for over 700 pages. There is a hardcover PFRPG version in the offing, I believe, though no release date has been announced. I'm converting this over to D&D 5.
The Red Hand of Doom (Wizards of the Coast) - Not really a 3pp, but this megamodule by Rich Baker and James Jacobs is hands down the best module that WotC released for D&D 3/3.5 in my opinion. I'll be converting this to D&D 5 for my newer group I think.
for 13th Age:
Eyes of the Stone Thief (Pelgrane Press) - This is in pre-order right now, to ship later this month or in March. I've peeked at my PDF copy and can't wait for the actual book to come so I can dig in. It's set in a living dungeon that periodically surfaces to absorb towns, forests, etc... It's written by Gareth Ryder-Hanrahan who has done really good work on modules for other Pelgrane Press games.
Feel free to send me a PM if you want any other suggestions... I have a ton of adventures for AD&D 1 and 2 as well.
EDIT: I forgot Courts of the Shadow Fey (Kobold Press)... it's the best PFRPG module I've read, and the first 3pp product I purchased after being burned out on 3/3.5 third party offerings.