What 3d modeling software do you use?
For modeling, Mac Rhino, which despite some funky Mac version derived from window version derived from command line version UI conventions, is probably one of the most solid modelling apps I've ever used on the Mac platform, and I've used the gamut of them going back some 22 years now. It kicks the snot out of autocad Mac hands down. There's some annoyances to be sure, mostly in the online help being not completely converted from the windows version, but in terms of the tools implementation it's very solid, and is very stable.
It is missing plugin support so it doesn't have grasshopper, or any of the 3rd party renderers yet and the built in renderer is ok for very basic stills, but I really don't even use it. Paneling tools aren't in the release, but are in the WIP builds, which you can use as long as your have a valid license. The intro pricing is good through sept 15th and at $275 is a friggin steal. The window version is $995 (although it does have plugins and a script debugger.
The Mac version does have scripting support via Atom and iron python, although I haven't had time to explore that much. The user community and forum support is surprisingly good, better than I would have expected, actually.
For rendering I'm using blender's cycles engine. I export as obj's out of rhino, bring that into blender and assign materials and set up the animation stuff and render with 2 cMP's with dual GTX 970's. It's not the fastest engine, and does lack dispersion, but you can work around that pretty easily via the node editor and get some very usable dispersion looks if your clever with the node programming. It does have quite an odd UI which takes a bit of getting used to. A lot of folks have complained about the render speeds, but it has very good support for multipass rendering and if you know how to leverage that along with a quite robust compositing engine you can slice render times down dramatically, literally to fractions of what you'd take with a single pass. It's physics engine is quite solid, it's script ability is very good, and for an open source platform it's pretty astounding as to what all is under the hood. It's also extremely solid. Never had it crash once in dozens of projects, which is way more than I can say for quite a few multi kilo buck "professional" products I've used over the years. (cough cough ****cad, cough cough F***Z, cough cough cough cough E**S).
For what I'm doing it's a very good combination of tools and workflow. So much so that I haven't needed to fire up after effects for post work since I started using them.