i came just across this new alternatives to IPP you might be interested in.
those optimized routines are probably mainly (but not limited to) a good use for image- and video-processing (opencv et al).
* framewave (formerly know as APL = AMD Performance Libary)
free, open source, cross platformm highly optimized (built by Intel competitor AMD), API compatible with IPP
free, open source, cross platform, highly optimized, less functions than IPP or APL