CraftLoader is a small framework mod that allows other modders to register "loaders" for their own crafting systems, such as machines, and loads them from resource packs, saves, and mods themselves.

A very bad explanation of how to use:

Recipe factories, registered the same way as vanilla crafting table recipes, are found in assets/<recipe owner mod ID>/crafting/<loader owner mod ID>/<name>_factories.json for mods and resource packs, and data/crafting/<recipe owner mod ID>/<loader owner mod ID>/<name>_factories.json - for instance, with a mod of ID "examplemod", smelting factories would be found in assets/examplemod/crafting/minecraft/smelting_factories.json for mods and resourcepacks, and data/crafting/examplemod/minecraft/smelting_factories.json for saves
Similarly, the recipes themselves are defined in assets/<recipe owner mod ID>/crafting/<loader owner mod ID>/<name>.json and data/crafting/<recipe owner mod ID>/<loader owner mod ID>/<name>.json, respectively.
Transformers, which are a map of String types to maps of string keys to lists of replacement values, can be used to greatly reduce the number of required recipes. They are defined in assets/<recipe owner mod ID>transformers.json and data/crafting/<recipe owner mod ID>/transformers.json.
A recipe's name is <recipe owner mod ID>:<recipe key name from JSON after being transformed>. Other mod's loaders may require additional data from inside the recipe definition to create a more specific recipe key.
A recipe can be disabled by adding "disabled":true to the JSON. if another recipe JSON re-declares that recipe with "disabled:false" afterwards, the recipe is not disabled.
A recipe's transformers are applied by listing them in a string array under "transformers", I.E. "transformers": [ "vanilla_metals" ]
to use another mod's transformers, prefix the transformer name with the mod ID.
recipes can use constants from the recipe owner's mod's constants JSON as inputs as well as outputs - in the case of output, the first matching stack is used.
Examples can be found in the examples folder at the source code.
To register your own loader, use the methods in the CraftLoaderAPI class.