Kingdoms of Kalamar
The history of Kenzer & Company's relationship with Wizards of the Coast is better handled by this question. To the best of my knowledge, all of the following products bore the Wizards of the Coast Official Licensed Product seal… at some point. It's entirely possible that titles are missing from this list or that dates are inaccurate; this information isn't as easy to come by as, for instance, information about Dragonlance or Ravenloft.
The Kingdoms of Kalamar Player’s Guide v3.5 Adaptation (Dec. 2003) updates feats from the Kingdoms of Kalamar Player’s Guide for the 3.5 revision, but some doubt lingers among fans about the Adaptation’s ability to change the Player’s Guide, either because the Adaptation doesn't itself bear the seal or because the Adaptation isn’t actually called errata. Ask the DM.
Eventually released was official Player’s Guide errata (2006), but it didn’t incorporate all the changes suggested by the Adaptation, and it was released after Kenzer & Co.'s license lapsed. Further, Kenzer and Company continued to publish Kingdoms of Kalamar material for the d20 system without the seal, including the Player’s Guide to the Sovereign Lands (2006), a Dungeons and Dragons 3.5 product that republished and changed again mechanics found in the Kingdoms of Kalamar Player’s Guide. This changed some of the earlier, more precarious game elements, but, because of their provenance, these fixes may not apply in a official-material-only campaign. Ask the DM.
To show how complicated this is, the feat Irresistible Spell (Kingdoms of Kalamar Player’s Guide 87), for example, is updated by Sovereign Lands. And the feat Miser with Magic (Kingdoms of Kalamar Player’s Guide 88), for example, received errata, is changed by the Adaptation, and is updated by Sovereign Lands. Again, ask the DM. A lot.
- 2001/03 Kingdoms of Kalamar Campaign Setting
- 2001/04 The Root of All Evil
- 2001/06 Coin's End
- 2001/06 Forging Darkness
- 2001/06 Midnight's Terror
- 2001/07 Harvest of Darkness
- 2001/08 Aldriv's Revenge
- 2001/10 Deathright
- 2001/11 Siren's Prize
- 2002/02 Lands of Mystery
- 2002/03 Geanavue
- 2002/03 Invasion of Arun’Kid
- 2002/04 Kingdoms of Kalamar Player's Guide
- 2002/06 Pekal Gazetteer
- 2002/08 Villain Design Handbook
- 2002/12 Fate of Heroes
- 2002/12 Fury in the Wastelands
- 2002/12 Lost Tomb of Kruk-Ma-Kali
- 2003/02 Strength and Honor
- 2003/04 Garden of the Plantmaster
- 2003/07 Dangerous Denizens
- 2003/08 Stand and Deliver
- 2003/09 Salt and Sea Dogs
- 2003/11 Secrets of the Alubelok Coast1
- 2003/11 Stealth and Style
- 2003/12 Kingdoms of Kalamar Atlas
- 2003/12 Loona
- 2004/04 Player's Primer1
- 2004/05 Blood and Shadows
- 2004/07 Friend and Foe: Gnomes and Kobolds of Tellene1
- 2005/04 Friend and Foe: Elves and Bugbears of Tellene
- 2005/07 Perils of Pekal1
- 2005/09 Black as the Brightest Flame1
Some sources include among this material Goods and Gear (July 2004) and By the Sword (Nov. 2005), but—so far as I can tell—neither text ever bore the seal.
Keep in mind that I'm not a lawyer and that my use of semilegal terms like license and lapse are colloquial. They are not meant to question, challenge, minimize, or impugn the actual chain of events that occurred between Kenzer & Co. and Wizards of the Coast. I am merely a fan trying to make sense of a list of RPG books.
1 Texts so noted were originally released with the seal but later rereleased after the license lapsed without the seal. This may apply to other texts on the list also, but, despite this, I have been able to acquire with ease the other titles with the seal. That is, so far as I can tell, a product with this note can't be acquired in its original form (with the seal) from the publisher; only by purchasing the physical product on the secondary market can the version with the seal be acquired. An items so noted may also have a different release date if it bears the seal, but I don't know that original release date as I haven't seen a sealed version.