After watching several videos praising it, I decided to grab a pdf copy of The Evils of Illmire. The adventure was written, produced, and features layout by Zack Wolf. There are several artists featured in the adventure, but my personal favorite is Jack Badashski. The plot centers around a a dangerous wilderness and a backwoods town under peril caused by a sinister cult. The original version was 72 pages, but Zack has updated it a few times. The current version is 125 pages. The rules are written for Old-School Essentials, but can be easily ran with other systems. You get pdf monster conversions for Dungeon World and Swords & Sinister Spells. Personally I might use it for my next 5e game.
Honestly though, it's not just an adventure. It's a "mini-mega" hexcrawl. Sixteen hexes are presented. The descriptions give you all you need, including encounter charts. There's also a variety of environments. From swamps to forests to mountains, there are a variety of dungeons and sites to explore. Each of these encounters is presented with a Dyson Logos map. Parties can interact with mantis folk, froglings, a witch, a giant king, and the Observer (who's definitely not a beholder). There is a directory of personalities and a hand plot and connection list. While I'm sure a party will eventually leave the 16 hexes, honestly you could have an entire campaign take place in Illmire. Once rid of the cult, the town would make an excellent home base.
So it's pretty obvious, I really liked this adventure. While I only have the pdf at the moment, I will either print it out of pick up a print copy at some point. You can get the pdf and print on demand on DriveThru RPG. At the time of this post you can get the pdf cheaper on itch.io. The pdf comes with quite a few extras, including maps, artwork, and thematic character sheets.