In my series "products using the Irrlicht Engine
which are not games", here's a new entry: CivilFEM
is a commercial Civil Engineering program. In the part 'CivilFEM Structural Designer', Irrlicht is being used:
Hugo González told me that they've decided to use Irrlicht because it is fast and it can be compiled in 32 and 64 bits.
In my opinion, it's again very interesting what kind of software can be made using Irrlicht.