Concept: The title says it all
Content: Great for adding colorful details to rooms, corpses, etc.
Writing: Concise but compelling
Art/design: Illustration sets the tone; typography maintains easy readability
Usability:  Roll a d100 or throw a small dagger

Concept: “A collection of tables, monsters, items, classes, rules and ideas”
Content: Includes a random monster generator, rules for distance travel and subsistence, The Death Ziggurat and Goblin Grinder adventures, rosters of mundane and profane gear, the Grey Galth Inn setting, a gambling minigame, the Black Salt environmental hazard, new character classes (Cursed Skinwalker, Pale One, Dead God’s Prophet, Forlorn Philosopher), and new Powers
Writing: Mörk Borg imagery and tone in wide a variety of styles
Art/design: Matches content to myriad layout and design strategies
Usability: The mechanical and expository elegance you expect from Mörk Borg; the monster generator particularly uses dice in a clever way 

Concept: “A five-paneled A5 portrait wall of death”
Content: NPC generator, gear & services, basic rules reference, core Powers list, generic enemy stats, weather, and d100 Items & Trinkets; inserts include Tablets of Ochre Obscurity and tables for traps, taverns, and city events
Writing: Concise with tones of grittiness and grim humor
Art/design: Player-facing side depicts major locations and characters; GM-facing panels are yellow enough to melt your eyeballs (but they’re perfectly readable and have clever, novel layouts for the expanded content)
Usability: Includes “photo corners” to hold GM’s choice of additional content on the left and right panels