In many ways Truespace is a lot like Anim8or. It's the first 3d modeler I was able to make any sense of due to my pathetic lack of modeling experience. It's heavily icon driven in terms of the model creation tools. Right clicking icons brings up settings panels to tweak the tools themselves. Right clicking objects is also the way tS edits them. I primarily use the last version Caligari released called 7.61 beta 8; it's actually two modeling softwares in one package. The 7.61 version is based around TS version 7 with more modern modeling tools, and the second version is an older more useful version called TS 6.6. The two are linked via a software bridge so I can switch between them both. I mostly use the older TS 6.6 version as to me it's easier on the brain, and it has quite a few popular model exporters. There's also a plugin structure like Anim8or that uses 6.6 TSX and 7.61 RSX based plugins for things like what Anim8or plugins can do. There are quite a few model export/import user created plugins. I found some for X, ASE, OBJ, and a ton of them used for the Unreal game engine. As far as ease of use I find it quite simple to learn with a little patience. As far as render options TS natively supports one called Lightworks and another called Virtual Light. It can render other formats via plugins as I recall. As far as I know it's still available as a free download. The United 3D Artists forum has more information and download links for anyone interested.
Btw, I go by BNG on that forum.