I had wrote very useful tool for game developer (who use UDK). This is a 3D world editor and Script Wizard FLCT (Fast Level Creation Tools).
It generate unreal script code for inventory, save-load system, menu, AI, traders, day-time cycle, chest, weapon, map/minimap/radar, spell panel, and many other. Mobile games creation also supported.
Maybe someone can use it to improve their games.
http://www.bludnikov.ru/eng.htm