A straight answer before I buy..?

So I see all these gamers streaming on Twitch, and they've got their webcam layer up in the corner. Under their specs all it says is that they use Black Magic Intensity.

Does the intensity shuttle software have live streaming features? Or After buying this product will I have to drop another 500 bucks into Wirecast?

I can't use xsplit because I have a mac.

To repeat and elaborate on my question.. If I buy a black magic capture product can I directly live stream to twitch through that, or do I have to go through another program for the streaming part? Thanks.

Black magic does not stream - and no software is provided to do that.

You will need another piece of software to stream. I thought there were free (or inexpensive) tools available to stream on a MAC (on the PC world any number of free or inexpensive solutions ara available).

xSplit or Flash Media Live Encoder would solve this for you for free.