My primary patron, Gabor Lux has just released a city supplement for 1e/OSRIC, which is readily adaptable to any OSR ruleset, and comes with awesome maps.
The port city is full of intrigue and has several layers of dungeon, with multiple entrances and a variety of inhabitants, from the typical bandits, thieves, goblins, orcs, low rent undead, up to animated armor, trolls and mimics, but also including weirdnesses such as floating eyes, a small army of paladins striving to see every last corpse properly buried, and acollection of doors that lead to strange places.it would be easy to port in Through Ultan’s Door here.
The NPCs have a good selection of interesting magic items and peculiar abities like magic resistance or magical luck.
You can get it here
It is of course, full of my artwork!
as usual, you can support my patreon
Or buy my stuff