OSR Modules with the best layout & presentation

[Celebrim]

I6 Ravenloft is still in many ways the gold standard, a height of combining aesthetics and usability to which we have not regularly (or ever) achieved since. I have a few quibbles with the module, most notably that the recommended levels on the module are about 2 lower than they should be for the challenge, but in terms of presentation of encounter blocks and the maps and the overall layout of the module, nothing has ever done better.

 

[Benjamin Olson]

Kelsey Dionne's The Secrets of Skyhorn Lighthouse is a great example.

...and apparently free?
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Cool!

I'm particularly impressed by the inclusion of optional cards to print out for monsters/enemy stat blocks. Flipping between four different monster manual pages for one combat is my number one pet peeve about running D&D combat, and slick cards for monster stats was the one fancy add-on in the Heroes of the Borderlands that really impressed me, but there I think it came at the cost of not also having them conveniently at the end of the module booklet like in the prior WotC starter sets, whereas here you get them there to.

 

[Sandbox Plots]

I can really recommend Adventure Anthology 1 and 2 by Necrotic Gnome.
The adventures written by Joseph R. Lewis are also very clear.