Not Quite Modded
Not Quite Modded is a specialized library for the Paper server software that developers can use to more easily create content closer to mods directly within plugins. The library allows adding custom items, blocks, projectiles, and visual effects without the need for resource packs.
Important Warning:
The library is in beta testing and not intended for mass use. The author made it publicly available to be able to publish their own plugins built on this foundation. Not Quite Modded was originally created for personal needs, but then interest emerged from other developers. Currently, the library is barely documented and can change dramatically at any time without warning.
Future Plans:
Long-term plans include creating comprehensive documentation for all library features and adding support for custom mobs. Once the library reaches a stable state suitable for most developers, the first full version 1.0.0 will be released.