Concept: A collaborative monster-creation effort
Content: An undead, slimy, scythe-limbed swamp dweller
Writing: Mostly mechanical but still conveys character
Art/design: Exactly what you want your death-metal swamp monster to look like
Usability: In Twitter format

Concept: “As long as THE GATE remains active, all death is meaningless to the faithful.”
Content: Fairly straightforward dungeon with heretical overtones
Writing: An accessible mix of exposition and stat blocks
Art/design: Reserved use of color provides emphasis, aids navigation
Usability: Supported by explicit visual connection of text and locations 

Concept: “A darkly shimmering GROWTH has overtaken the town.”
Content: A pointcrawl amidst malicious overgrowth
Writing: Concise; mostly devoted to stats & mechanics
Art/design: Map and art are prominent without encroaching on the text
Usability: Small text emphasizes the visual elements but may be difficult to read

Concept: “From an underground Sarkash crypt, heretics and cultists terrorized settlers.”
Content: An occult dungeon with random events and escalating enemies
Writing: You may learn some new words; use them to terrify your players
Art/design: Establishes atmosphere; concreteness provides easy navigation
Usability: Very intuitive and efficient layout

Concept: “The world of people never much agreed with you; instead you sought the company of beasts” 
Content: A delusional zoologist.
Writing: A primitive class whose connection to animals is wildly open to interpretation.
Art/design: Cave illustration just adds further to the ambiguity to the story. 
Usability: Easy to use, flexible in characterization. Cover art by Nohr is available on Twitter.