Modonomicon
Thaumonomicon-Style In-Game Documentation
Data Driven
Modonomicon books are defined via json files and can be added/extended in both mods and datapacks.
(Extended) Markdown
No need to learn a new markup language - all text styling can be done in markdown. Minecraft and Modonomicon-specific functionality is available with extensions to the markdown syntax.
Inspired by the best
Modonomicon is built with two excellent documentation methods in mind: Thaumcraft's quest-view style Thaumonomicon and the extensible and data-driven system of Patchouli.