Github Link: SSMT4
This is a powerful, easy-to-use, and actively updated open-source 3DMigoto mod management and development tool.
Its mod development functionality requires Blender 5.2 LTS+ and its accompanying plugins TheHerta4 or TheHerta4-seele version.
Detailed usage instructions can be found at this link.
Furthermore, for features such as mod reverse engineering that require closed-source implementation, please refer to the standalone paid tool MiMiTools.