ASE to T3D - ASE to T3D is an application for converting from discreet's ASCII scene exporter file format to Epic's Unreal Editor T3D format.
CompressAlot 1.1 - Nice tool for compressing files to .uz format.
Meshmaker - This tool allows you to turn prefabs into meshes or export to model format.
Unreal FX - This little gem allows you to change surface properties of your model files.
Tex Align - Use this to help you align textures on curved meshes.
Fhred - A nice hex editing tool for converting Unreal maps to 225 - Tutorial