From the Forecast page I know that the Realtime Game Editor development is on hold, but there are other tools in External Tools as well.

I'd like to is there any overlap features in those tools? or a unify tools?

For instance, there is terrain editor in MED, WED, Realtime Game Editor, External tools.....too overlap I think.

Why not create an ultimate editor include model, level block, terrain, source code, shader, panel?