Which software do you use to convert models?
We use Open Asset Import Library, an Open Source library that reads arounds 30 different 3D asset formats and knows how to write some of them as well.
Is this service affliated with the Assimp/Open Asset Import Linrary project?
Yes, it is operated by one of Assimp's co-founders.
Why would an Online 3D Model converter be useful?
Excellent point, but some people do find it useful. Apart from that, how much free offline software is there that does a decent job at converting 3D models?
Is this the last FAQ entry?
Yes, it is.