Concept: “sleeping outside also puts you at the mercy of smaller monsters, of a different kind, of a different order.”  
Content: 1d4 diseases... well, two are parasites.
Writing: Full of enough flab, worms, and fleas to make your brain itch and your blood boil.
Art/design: Illustration of some sort of medical procedure, and a faint spattering of blood. With strong yellow highlights.
Usability: Definitely not sterile. But those yellow highlights shortcut to the rules. 

Concept: “Established three generations ago by tax scofflaws from Schleswig, this mercantile utopia teeters on ruin”
Content: A three-act city crawl of procedurally crumbling districts and five dilapidated adventure sites. 
Writing: Moldering descriptions of urban decay blend with a malaise of frustration and angst to characterize the collapse of a culture fueled by greed.
Art/design: Haunting depictions of crumbling infrastructure and desperate souls contained in a dynamic and visually stimulating design.   
Usability: Accessible and easy-to-reference adventure design. 

Concept: “Blood can be the most potent source of neurosis for the human mind” 
Content: Six monsters, three artifacts, six new scrolls, a wasting disease, and a trap. Oh, and buckets of blood.
Writing: A fair balance of stylistic description and mechanics. Viscous but unclotted.
Art/design: A gory art collection in comic style. Familiar blackletter styling on yellow and black.
Usability: The blackletter is scaled with its level of decoration for legibility. 

Concept: “From the darkness, they emerged. Of the darkness, they are made.” 
Content: The aforementioned fiends and related diseases, parasites, and tables.
Writing: Themes of infection, subversion, and infestation tie this book of beasts.
Art/design: A mmutilated mashup of tortured illustrations in a stylized but effective layout.
Usability: Rules and description separated and identifiable for ease of reference. 

Concept: “Thank the discourse for this little gem.”
Content: An entitled mob for Mörk Borg.
Writing: “Shit. They really want to talk. The fucking GM is going to start doing accents.”
Art/design: Flippantly casual layout above illustrations of obnoxious finery.
Usability: Talk to them. Or don’t. You decide. 

Concept: “There’s this strange wriggling sensation inside your ears and head.”
Content: A scenario with stats for NPCs and, of course, mechanics for brainworms; optional content includes additional items and a monster as well as stats for Mausritter
Writing: Elevates sardonic cynicism to an artform
Art/design: Linear layout punctuated by shocks of color
Usability: Easy to digest with well-placed stat blocks

Concept: “If you ever drink the water of Lake Onda...”
Content: A thirsty little throat parasite.
Writing: Some serious slow-burn body horror.
Art/design: Thirstworms hiding in their natural habitat—behind the boxed text.
Usability: Mechanically more disease than monster honestly. 

Concept: “Five parasite-themed and infection-based weapons. Why? Because it is fun and will probably weird out the players.”
Content: A brain-parasite sea star, a bug-launching crossbow, a dart-shooting clam, a stick-mounted stinging insect, and a flesh-eating worm grenade
Writing: Provides a few paragraphs describing each item’s nature, uses, and effects
Art/design: Relatively traditional half-page presentation with text and illustration
Usability: Caution—may weird out the players 

Concept: “From the safety of her chamber… the Mother preaches of the gifts Consumer may bestow upon her luckiest of followers.”
Content: A tongue-gets-eat survival horror dungeon crawl. An arsenal of religious paraphernalia.
Writing: The history and rites of a mysterious cult. A cathedral turned labyrinth. A parasite that thrives in dark and wet places.
Art/design: Gritty gothic structure with occasional baroque elements. Illustrations which contrast in their perverse clarity.
Usability: Dark, light, and full color. Digital and printable options available. 

Concept: “Roleplaying In A World Of Bioweapons” 
Content: Complete rules for bioweapon fueled modern survival horror, with a swamp crawling starter scenario.
Writing: A detailed alternate history setting with mechanics emphasizing resource management, body horror, and tactical dismemberment.
Art/design: Neoclassical & romantic oil paintings and biological illustrations juxtapose a partially collapsed 2080 setting in single column layout.
Usability: A robust table of contents, utilitarian layout, rules reference, and character sheet aid in reference to this slightly more robust ruleset.  

Concept: “The Queen is dead. Long live the Queen. She squats atop her silk throne”
Content: The end of an empire. A parasite deposed.
Writing: Many hooks and threads ensnare a micro setting at one instant in time.
Art/design: A tightly wound, regal design befitting a 700-year reign at an end.
Usability: Easy to navigate. Requires some translation at the table to be fully compatible. 

Concept: “These heretic ideas are collected below the frayed parasol of corrupt religion and cute parasites”
Content: 7 new creatures, a living dungeon, occult-bugs-as-resources rules, and tables for effects of parasitization
Writing: Creature entries feature descriptive passages, stat blocks, and adventure hooks; overall, creative and effective
Art/design: More traditional layouts with text balanced by facing-page illustrations; images are generally gritty (in the good way) and the rest of the graphic design follows suit
Usability: “Cute” is highly subjective, but definitely some interesting and creative creature concepts

“Time has passed and the followers are no more. In their place, these new strange parasites live.” 

Concept: “⏁⊑⟟⌇ ⊑⍜⋔⟒⏚⍀⟒⍙ ☊⊑⏃⍀⏃☊⏁⟒⍀ ☊⌰⏃⌇⌇ ☊⍜⋔⌿⏃⏁⟟⏚⌰⟒ ⍙⟟⏁⊑ 𝕸ö𝕽𝕶 𝕭𝕺𝕽𝕲 ☊⍜⋔⟒⌇ ⌿⏃☊☍⟒⎅ ⍙⟟⏁⊑”
Content: A close encounter of the third kind. 
Writing: Gut-wrenching alien descriptions for one out-of-this-world scvm. 
Art/design: A violent, colorful, and strangely recognizable figure with an impactful visual design.
Usability: Surprisingly un-alien. Thoroughly legible. Human printer-friendly option. 

Concept: “The god has fallen from the sky. Its giant body scattered. Some parts have been recovered and saved by the Kultists. Meet his brain, one eye, one foot, one hand and maybe more body parts in the underground temple!”
Content: A god crawl divided into parts.
Writing: Adaptive and dynamic encounter design make for more dynamic combat encounters.
Art/design: Disturbingly detailed map by Brian Yaksha, clear use of color to indicate rooms and features of interest, mini-map navigation, and stats incorporated into room description text.
Usability: OSR style abbreviations require some minor translations for Mörk Borg.