This plugin allows you to create custom furnace recipes to your server, e.g.
Iron Sword melts down to 2 Iron Ingots. All customizable with a config.
How do I add my own recipes?
With the config.yml the plugin creates for you. It's in the SalvageSmelter directory in your /plugins folder.
To add a recipe, you need 3 things. The source material (e.g. an Iron Sword), the result (e.g. Iron Ingot) and the amount of the result (e.g. 2). The time it takes to melt the material and the exp the player gets is optional.