AMD has created a developer website for its GPUOpen initiative. On the website devs can find open source SDKs and libraries for graphics cards and GPUs in APUs.
The GPUOpen Portal will provide developers access to open source content, blog posts and industry updates, with all of the open source content being hosted on GitHub. GPUOpen is divided into two groups, Games and CGI with SDKs and libraries. Then there's a profession sections for Pro Compute related matters with applications, tools and libraries for high performance GPU computing.
Everything is open Source and free to use as it is including copying, using and reselling. On the website you'll find source code for stuff like TressFX and ShadowFX as well as platform materials for virtual relaity development.