A free app for Windows, by TerenceYao.

FISSES is an easy-to-use, modernized version of the popular FISS Mod. The goal of the project is to provide a simple, intuitive interface for users to save and reload in-game variables (such as MCM settings) and save and load their custom textures (such as those from the Mod), as well as export them to an XML file. The XML file can then be imported into a game of your choice to use the saved variables and textures.

FISSES can save and load in-game variables and textures for you, and it can also save and load the current state of the game.