Almanac is a library used by my mods with mostly loader independent shared code between multiple mods to avoid duplication of code.
Almanac by itself does not add much other than a fix to empty tags leading to non stackable items.
Improves performance by tweaking mob despawn rules.
Adds more frog variants to minecraft.
Adds more villagers with new professions and workstations.
An API to add custom villager professions and villager biome types with custom trades without writing code.