CustomThings
The CustomThings mod enables the creation of custom items, blocks, achievements, and recipes using JSON files. This is the perfect solution for modpack creators who want to add unique content to the game without needing to program separate mods.
All necessary documentation for using the mod is available on the GitHub Wiki. If you find that some functionality is missing, create a request in the tracker - I will definitely consider adding it.
The mod requires EnderCore to function.