There is irrEdit/coppercube[1] and EditIrr[2][3]. irrEdit is from the original creator of irrlich and editIrr is produced by some of the people from the community.
Thanks.
I am now using CopperCube but there are some problems.
I have tried to load that "example.irr" but it failed.....
Also, I have tried to add a sphere and set its behaviour to allow rotation, then I export an irr file. But after the loadScene(), the sphere is not rotating....how to make it rotate as shown in CopperCube?