Modding/Tools
From NEBULOUS: Fleet Command Official Wiki
Asset Bundle Extractors
Asset Studio
AssetStudio is able to extract models and textures of the prefabs stored in Unity AssetBundles. However some other prefab parts, such as particle effects, are beyond it
Asset Ripper =
AssetRipper, which is a more actively worked on and supported project and can extract more assets but also cannot do shader or VFX graphs.