Ok I obviously like crafting =P You can make a crafting system really complex or simple, it's really up to you. So I'll list the complex types of crafts and just know that you could condense them down into simpler categories to suit your needs.
Gathering Crafts:
Mining: for ores or gems. These can then be processed into bars or gem cuts and you could do things with those. Like make weapons, armor or jewelery.
Woodcutter: Harvest different types of lumber to make furniture, gifts, or weapons and shields with.
Skinner: To skin animals of skins to make leather
Plant Picker: Collect plants for use in potions, food or fibers for making clothing or paper out of.
Fisher: Catch fish to cook
Refining Crafts:
This just process raw ingredients from the gathers. So they might take the raw ore and smelt them into bars that a weapon smith could turn into a sword.
Smelter: Turns ores into metal bars
Tanner: Turns animal hides into leathers
I can't think of names to refine the other types of materials =P but you get the idea
General Craft Types:
There's the standard Blacksmith (I consider this any type of metal working so armor, weapons, some knicknacks).
Armorsmith: Makes metal types of armor - plate, chain etc
Tanner: Cures hides and makes leather armor and leather pieces for use in weapon crafting.
Tailor: Makes clothing from fiber materials - robes, cotton shirts etc.
Weaponsmith: Makes metal based weapons
Wood Carver: Makes wooden weapons and/or furniture to be placed in houses.
Gunsmith: Makes guns and cannons
Scribe: Makes scrolls of spells that can be used and consumed in battle.
Engineer/Tinker: This can be a catch all for a lot of stuff. They might make crazy gadgets to do stuff spells might normal do. Or they could make cogs and gears and other parts needed for other craft types to make recipes.
Cook: Make food that restores health or adds stats to the player/party
Alchemist: Mixes potions for use in battles or mixes paints or dyes for other crafts.
Brewer: Makes alcoholic drinks (makes you strong but.. sloppy)
Jeweler: Makes fancy bangles to equip.
Complex Crafts: These would be slightly harder to implement in a RPG Maker game without more scripts
Poison Making: To tip weapons in so they deal more damage.
Rune Crafting: To slot equipment with bonus stats
Carpenter: Makes furniture for houses
I'm sure that's many more that folks came come up with, but those are some pretty common ones.