The AudioClip plugin can export uncompressed.The TextAsset plugin can export and import.
tga files and decode&encode most texture formats used by Unity.
There are multiple plugins to convert Unity assets from/to common file formats : Custom MonoBehaviour types also are supported. Type information extracted from Unity is used in order to generate text representations of various asset types.
It can create standalone mod installers from changes to. UABEA is a tool that let you apply modifications in assetbundles files and save them with your modifications.