Yanfly Engine Plugins is a plugin library made for RPG Maker MV, a wonderful piece of software to help you make that role playing game of your dreams. You can find out more about RPG Maker MV here.
You can grab the plugin here:
English Mirror
Item synthesis is now a pretty common aspect of most RPG’s where the player can craft their own items after acquiring recipes. This plugin enables your players to be able to do that after acquiring the said recipes. Recipes can come in the form of items, weapons, and/or armors and transcribed in them are what items, weapons, and/or armors they can make. These items can be made from the main menu and/or synthesis locations!