Unfortunately AMD doesn't natively support 3d as nVidia does. Tridef is a 30day trial I believe, and it's pretty good software if you can handle making the tweaks required with it. All in all AMD isn't as streamlined in the 3d market, but they have a more open hardware support (as far as monitors being supported) so if you decide to get a real-3d monitor (with flicker glasses) you get a bit more selection at a much cheaper price (you can get an S23A750D 23" 1080p 3d monitor for 350$ if you watch for sales).
In doing a little research, it seems that iz3d (another 3d driver similar to tridef) actually supplies their anaglyph 3d driver for free. I've never used iz3d (tridef came with my monitor) so I'm not sure about how to use it, but here's the link:http://www.iz3d.com/3dtechnologies
I think tridef 'may' also have higher quality 3d effects than nVidia, simply because I see alot of nVidia users in their forums, but it maybe just that they don't have the nvidia approved monitors.
Here's a link to the tridef site, their software costs 50$:http://www.tridef.com/cart/home.php